Malicious PDF — malware analysis report

Static analysis result for SHA-256 985f911029bcb0f0…

MALICIOUS

PDF

66.8 KB Created: 2021-03-11 18:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9e1a5102eb000110c113440836a2a64 SHA-1: 9c0bd979a52692ff2fbcad3222ae9df2ac6c4706 SHA-256: 985f911029bcb0f0f9e99e1c589ef9f28d5a2e964288e4938417632a9b2c0f38
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=adobe+illustrator+tutorial+pdf+free PDF link annotation
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/512218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_600d412c4ef0c.pdfIn PDF document text
    • http://sodalabs.pro/13561355305x4eop.pdfIn PDF document text
    • https://cdn.sqhk.co/wejewenu/jhhiifY/use_assistive_touch_to_turn_off_ipad.pdfIn PDF document text
    • http://gufutaca3.xyz/four_characteristics_of_useful_information1fwfi.pdfIn PDF document text
    • http://helpforteam.com/calculating_speed_time_distance_and_acceleration_worksheet_answersyata2.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/jufavede.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/K6kWjid/fenebededu.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/dagudete_pives.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/47439892081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/cbo_full_form_in_software.pdfIn PDF document text
    • http://palexibibiw.atwebpages.com/quadratic_equations_problems_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/dodejuvokupiwamujefok.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/29849637724.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_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 5164 bytes
SHA-256: ff2a279c34c5f3d0890acc4255d883bb10d09a11ade7744bcb70fe8808fb80f9
font_01_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 9544 bytes
SHA-256: a019765c54f2780a2df0c804aafd80cb6149af9000c7b28e1f819f7a19fab326

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