Malicious PDF — malware analysis report

Static analysis result for SHA-256 934e10b1df3b4a3d…

MALICIOUS

PDF

47.8 KB Created: 2020-11-05 21:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 42671670169f9f5fb3579c9c4c4e839e SHA-1: 97bf515a4774c0340597055d645d7fffd5cb57f3 SHA-256: 934e10b1df3b4a3da25e2773a9e889536b354bd334f73070565ab490ff4783a6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified as a link farm, with a specific heuristic flagging it as a brand-impersonation credential phishing lure for Apple. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. The ML classifier strongly indicates maliciousness, and the presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1380891.pdf.
  • 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://trafficel.ru/strik?keyword=google+search+engine+homepage+website+us PDF link annotation
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1380891.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/2373114.pdfIn PDF document text
    • https://zupipozove.weebly.com/uploads/1/3/4/5/134589893/8737bd7f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5f9a5a097b345.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/momanox.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/9085281.pdfIn PDF document text
    • https://pusinoki.weebly.com/uploads/1/3/4/6/134628586/d4c3cf0d2812a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5f97847225684.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/6711581.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/cd513c7c-7415-4c2d-80ca-84f9a9124128/zexevagowodosirel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2463/6823/files/examples_of_hybrid_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/scotch_shipping_tape_3_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/alienation_ps4_trophy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0824/4381/files/3701391489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9c8348-ede1-4a70-b558-e568fd39c0d8/53548502825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66b7555-256b-4e78-8b61-4920e84ce492/vujenapikirotejapizabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b22f5f-a680-4532-8520-11b40c76d1ae/kexenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132aff71-7f13-48d1-883e-414ba00ac869/15937841561.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6366 5784 bytes
SHA-256: 4ff671d7e24d9b0a0747c42cadcb53e0f5e64ae6d81b4cf49431eb09fa8ed33b
font_01_sfnt_off00007753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7753 5608 bytes
SHA-256: 8f79ab7013f4691f0ef6bb39af69b8a1c66c0a1f72461f7c71b8d4708702caa9
font_02_sfnt_off00008a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 11584 bytes
SHA-256: 79d89bd35d9a79093ae966cb6426a354f65846cfe8d92724fb3364ebda100ded