Malicious PDF — malware analysis report

Static analysis result for SHA-256 726082b28ef7c9ec…

MALICIOUS

PDF

82.3 KB Created: 2021-06-11 07:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6b31464f75cb5d3c3484b16808c6adfa SHA-1: 146e8dd65f3e9327fd67a5ac7158ec5d9f15be87 SHA-256: 726082b28ef7c9ecbac72179bed930d2af2bfff28fd42bb9895ec4d94e9672f5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://infrive.ru/pbw?utm_term=dbz+mugen+download+android PDF link annotation
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/kefedizobejo.pdfIn PDF document text
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/7038917.pdfIn PDF document text
    • https://zusadadej.weebly.com/uploads/1/3/4/8/134856209/00061daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_601bdf451430d.pdfIn PDF document text
    • https://gimepofu.weebly.com/uploads/1/3/4/3/134365645/6043009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_606038e3a9d2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fddcf5e8d6f4.pdfIn PDF document text
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/cc61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_603ad27374261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144415959/download_after_1.pdfIn PDF document text
    • http://xuladejuzor.pbworks.com/f/nakojubotobezabalitug.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/how_to_write_sick_leave_message_to_manager.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144605295/the_sixteen_regions_in_ghana_and_their_capitals.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/145031178/romeo_and_juliet_full_movie_free_online.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/combined_gas_law_worksheet_answer_key_page_22.pdfIn PDF document text
    • http://gisugakeg.pbworks.com/w/file/fetch/144653565/what_is_the_mars_rover_mission.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/w/file/fetch/144583989/gujarati_bhajan_lyrics_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd8d329-b4f0-4800-8618-dfdc1d15b278/platos_symposium_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb7d918-e75e-445f-a878-2f1682704f46/7093159923.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/92457652540.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/w/file/fetch/144702600/86785943886.pdfIn PDF document text
    • http://madatev.pbworks.com/w/file/fetch/145001799/13498887836.pdfIn PDF document text
    • http://kefatezalix.pbworks.com/f/how_to_sync_photive_sport_headphones.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144523620/44603417659.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 5248 bytes
SHA-256: 0292afd6cda9d09f2460500a0a72ddccd65078b9957a832eb5cca194185c45c1
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 11360 bytes
SHA-256: f72804547b2c2a400fd40f3bfe40788b95294c94dec9f418c7536f1daea980bb
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 16168 bytes
SHA-256: ae589a8908edfa401d14dbd9e1af54581a6fda3788897693f48e43c1b1ff4584