Malicious PDF — malware analysis report

Static analysis result for SHA-256 3729fbd32bed1fbb…

MALICIOUS

PDF

82.8 KB Created: 2021-03-12 02:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a4ac6f1287cd0ecfcfa2f83f4bd9b1ad SHA-1: 389913a9a41d25540baf936cb5b45315a4f2099f SHA-256: 3729fbd32bed1fbb93a09cdb4469e0704873b0879196009dc1ea569ddb42fdf4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://xezojetit.ru/award?keyword=medio+ambiente+definicion+pdf PDF link annotation
    • https://cdn.sqhk.co/luwagoma/MhfaUhh/fapiwuzokuxafinidesovuzaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fe4ff8c7082b.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/ic9ghY8/vp_racing_fuel_jugs_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/jbegeY5/zoxoroj.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/how_to_get_movie_maker_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/fhg5Vjd/tunitojasabadogerajil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5fe45e697d8c0.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/IjblBzt/knight_rider_cast_2008.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/alkaline_diet_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5fff515bb7f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fd0f39021fd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_3bcdb5e7170d470db44f749d1b31e6ed.pdf?index=trueIn PDF document text
    • http://zejusamipokera.myartsonline.com/how_to_help_a_teenager_with_time_management.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/writing_task_1_line_graph_model_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/39184056630.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_9aecc65b33ee405194b00f93092d1c2d.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_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 5140 bytes
SHA-256: 14fd599c02b968719ff21531b3562cf03fbc29e129c6944527b13adb4540c8e6
font_01_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 11728 bytes
SHA-256: 19f9c09451f35bd774c4651311c2e877aa45528abbcc297cc6b2d28bf7bd6e2f

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