Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b45108cd1dc541…

MALICIOUS

PDF

66.5 KB Created: 2021-01-25 22:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4b4ef087f107aad85c2603f788f7ba3f SHA-1: 5b8ceac50e767bb91d5ebe700761f7855f6eeb19 SHA-256: e9b45108cd1dc541fc77ddf7d438b508fa8a6377a71cfd48bdfe3cde4803620c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://trafffi.ru/123?utm_term=computer+hardware+matching+worksheet PDF link annotation
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/379769.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/vifusejiwix.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/hfgdijO/80_s_rock_hits_top_100.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/rosate_360_tf_safety_data_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fd05f0db54aa.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefulurifu/jjojfih/rapid_transfer_skrill.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/jhKhjic/30318457170.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/bb054fb2f363.pdfIn PDF document text
    • https://vazaratel.weebly.com/uploads/1/3/4/0/134017227/vujifixum-nexenuzejodirep.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/dhbggpk/larabafotolunagavakujofo.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Mlhacic/tangled_the_series_season_3_episode_11.pdfIn PDF document text
    • http://bakelenodizaro.iblogger.org/firofiwegakadomoruk.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/nuton_pixorizuguber_lumulikoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojizodujibibo.epizy.com/55046256950.pdfIn PDF document text
    • http://jevoneloz.epizy.com/fallout_76_pioneer_scout_tadpole_exam_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 5516 bytes
SHA-256: 219fe28e6262aa1a3d12eb2d7fa754a10d95402661cc8563ab69303db9a98e34
font_01_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 9584 bytes
SHA-256: 9b61881cab2e48fc67f868f1e9bd5f7c1d95e704bd1d213d7e5f1163113d42ee

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