Malicious PDF — malware analysis report

Static analysis result for SHA-256 78206b441693a95d…

MALICIOUS

PDF

85.0 KB Created: 2021-05-17 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3dcd7cdde541a90c9a9679d6eb71d8bb SHA-1: e00a5d23a53a97e55e908d9c246f9a0e2a1a7bf8 SHA-256: 78206b441693a95db2910abea2631ac14ca567321cbf1843e95353bf92bc429e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, detected as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=how+to+use+the+instant+pot+duo+evo+plus PDF link annotation
    • https://cdn.sqhk.co/risenulowo/IDhgoii/vemofadikinoninig.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/hxsojas/crossing_void_global_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/SgicKig/87111507516.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/kobetimezijadutabisekejij.pdfIn PDF document text
    • https://cdn.sqhk.co/bivaxijo/jidhjhc/worlds_hardest_game_2.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/emjzid2/30588408405.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/xjgOqhf/lajotazemer.pdfIn PDF document text
    • https://cdn.sqhk.co/mojerakikav/8iehhhy/dinosaur_game_arcade_games.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/Ijdlaja/vezixowedan.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/a3hdiFB/jewels_magic_mystery_match_3_level_69.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/iiiJgfs/sony_srs_xb12_sony_music_center.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/giFX0hg/tibajutegawivokavofe.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/blessed_be_the_name_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/ehdeKjh/10331473496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0ec19a-9cfc-42c9-af4c-ebbca5f6582f/klipsch_r-41m_bookshelf_speakers_review.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/88046102643.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_57803edad27d4bf694812077d8b90774.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/545279f2-8deb-435a-9849-eb5bebab63ac/how_does_whole_foods_order_pickup_work.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_b5dfdbccd851452eb4ce720150f012a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cd490f-07b0-4cac-b285-6fe316b12007/tiperinusipirujozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cc7bfa-3df5-42eb-a424-819e899094c9/what_years_did_the_ford_explorer_have_transmission_problems.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_8c2905cdde2148fe97c02f59523f9518.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5016ec18-9fde-418c-bf38-49598539ab33/how_to_start_a_reflective_essay_introduction_examples.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_e8c62e1b19d842a1a93a93817abeb153.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 5064 bytes
SHA-256: 0dc731b46468825414abdc983cd5482c0f921b5ecdfdf60abb5785ce649ce383
font_01_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 11700 bytes
SHA-256: b9c13dacc0293c9bc50ba6ba8dbd2aff1116da764b885a6d24d37f2290ab45b1