Malicious PDF — malware analysis report

Static analysis result for SHA-256 921b7129f679640d…

MALICIOUS

PDF

71.1 KB Created: 2021-06-03 03:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8a52769dbb3e115c4434ec9009695e2 SHA-1: 10ca01e07f62e25beafa58d212b33ae6691460c9 SHA-256: 921b7129f679640df94a32a440a6496b681b3aecbaa584d7d94d58732b1ba075
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://garglob.ru/pbw?utm_term=modals+test+worksheets+with+answers+for+class+7 PDF link annotation
    • https://sakedupepig.weebly.com/uploads/1/3/4/3/134355988/ed45c0c43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fe2c8a7ebbbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_6026affb59466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_602e639fa3828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_604fb19e09309.pdfIn PDF document text
    • https://vunatoja.weebly.com/uploads/1/3/0/7/130738644/2253226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_601a73a4e7ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_60251d2752ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_60541824d8244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6060fecbdee7a.pdfIn PDF document text
    • https://sifameduj.weebly.com/uploads/1/3/4/5/134522790/nitakukilubit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_606532e84c9c1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4480148/normal_60b6998aa18c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fcc9253c9676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_600b2b3e2bd7d.pdfIn PDF document text
    • https://xenolato.weebly.com/uploads/1/3/4/8/134868471/3575e5cad28f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_6053353e31694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_600266abe6e9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubekikewabi.pbworks.com/f/77289702722.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/criminal_case_free_bonus_collector.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/best_book_for_learning_c_programming.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 5348 bytes
SHA-256: 76817893af330e76dd94125283feee3422a1cd533fbfc5f106bbd6b8de632b6a
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 10448 bytes
SHA-256: 9a803317eaa13ac8f0cc719eb4a43b5a1d24991706239011c97c055c937d075e

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