Malicious PDF — malware analysis report

Static analysis result for SHA-256 041a19beeb91466e…

MALICIOUS

PDF

102.4 KB Created: 2021-05-11 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2575201efd7f363dc6896eb8e7574120 SHA-1: 20701297f2d38ad2fbc05009b249e885124bcadd SHA-256: 041a19beeb91466e900964829777092cd8a67b7b62977ea3d3aebfc6f568ac45
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it contains links to known malicious redirectors and is part of a link farm on disposable hosting. The embedded URLs, such as 'https://crophysi.ru/strik?utm_term=what+is+the+purpose+of+literary+text', are designed to lead users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=what+is+the+purpose+of+literary+text In PDF document text
    • http://wikowezenitezo.medianewsonline.com/persepolis_1_and_2.pdfIn PDF document text
    • https://cdn.sqhk.co/detobero/jghiXOU/37082499958.pdfIn PDF document text
    • http://nemagufi.mywebcommunity.org/89437402979.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/bjeMheY/xitipofoxefib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_600398c6e99d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_60317d511340c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_60055bc0ca115.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/cedulas_do_brasil_em.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/buvusuxajoses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_6036b5ea992f8.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/39472290512.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/28902709834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_60634bde58e83.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/what_is_sum_to_infinity_of_a_geometric_sequence.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/P6njhdK/skyscraper_movie_poster_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_e846e01592d94947a7c0ae4b0f93860e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/718a8886-dbca-4e7b-9f98-74ec732d51c2/dimensions_for_parallel_parking_test_mn.pdfIn PDF document text
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_08ac098dbf50490b8260ba83caa26244.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc77f058-146e-4c5a-b0ca-9f28bff796a0/lg_4g_lte_tablet_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9ea6cb-eb9d-47be-92b6-e3a57561b8aa/graphtec_cutting_plotter_ce6000-60_price_in_bangalore.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_3c658d602a0f408e983355e91ff88ec2.pdf?index=trueIn PDF document text
    • http://lawiferow.myartsonline.com/pdf_akreditasi_puskesmas.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_5284d2a9be134d0594ffef5dfb6c0d94.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_3509698b39dd4401b62d7b0cbaaafe29.pdf?index=trueIn PDF document text
    • http://mujebik.atwebpages.com/tepadipagilijamusin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 6416 bytes
SHA-256: 4257b5aed261ccb96d7b6b52587b843e34ad9d65b35b79aec213b77d78697daa
font_01_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 5172 bytes
SHA-256: edb03a07b43bfa9cfda2ada2ea18dac807bacc4570813043f91ee4dbe390a32d
font_02_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 8364 bytes
SHA-256: 82786e842b0dc16de0c85401e3e69bcb3a3f3a8ef3ea23900694b08ad433217b
font_03_sfnt_off00014675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14675 10800 bytes
SHA-256: 5f7f33e9e87c8f7f11355ce813fee107855b66046e1ffd211d417cc01b1f3199
font_04_sfnt_off00016ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA6 16256 bytes
SHA-256: d9b6788e98d720ed34e7048aeb7a337db0b6f87b8f940ce258886e614f67cbc8
font_05_sfnt_off00018104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18104 1740 bytes
SHA-256: 30155f06aedfb79de9f70f3e8e1372addaeb1c7fe56136300e854ed0c3fac0c5