Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c277a77d1f820f…

MALICIOUS

PDF

75.7 KB Created: 2021-06-12 11:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ee069d1795f8124430859298ad01f818 SHA-1: 4932ba9b10d0269eb42137a06f7bb27fbc21ec34 SHA-256: 74c277a77d1f820fcbf401a4d602c8956a4590e810a217cffd2773ffbd3ae6cd
186 Risk Score

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 0.9996

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://irlanc.ru/pbw?utm_term=ayesha+at+last+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386354/normal_5fe48d69205e4.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/6543436.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/9099752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fff98f65e679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5fe92b10704aa.pdfIn PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/02059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_603eb255957e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5fdd0632c551b.pdfIn PDF document text
    • https://wiwasowabomas.weebly.com/uploads/1/3/4/8/134858473/tupukarowat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_5ffa629314589.pdfIn PDF document text
    • https://kijilijesudopob.weebly.com/uploads/1/3/0/7/130739968/04e8153e2a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff9c37e2301b.pdfIn PDF document text
    • https://popezerimev.weebly.com/uploads/1/3/4/5/134514232/6406027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d2b697-a5a0-4d2a-9368-a1b9848bc575/tagiwololevawuniritexunuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d5a04f-23bd-4691-8cd6-40a4ced0cfde/32731422736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a87f27a-3994-448d-b672-09a7c10d183b/hp_envy_4500_not_accepting_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97591ce1-bf96-4a8b-8247-08fa0f47ce93/star_wars_heir_to_the_empire_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ba1793-6f49-42ce-b251-c4852e9e0155/buzaliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1efdcef-b066-41f6-9107-adc3c36b4487/how_to_trade_options_on_thinkorswim_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567f99ad-8873-4d83-8f39-2172d6f7395e/20945972332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf07f1ac-4e67-45b9-b385-8e7eb90a57bd/76785651283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d15bd29-1a99-4f33-b89d-9b9c832f8246/vilixaje.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_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 5328 bytes
SHA-256: 2e59607a60cd90867f38e4a920df2c5037754cecbb56572a50b4a52bb216d36c
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 10692 bytes
SHA-256: add9987f47f33e8dd4f9da4976f5e587a81cc3f12c463d73b3b7b1ab1de72d4e