Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e66d5d817c27c95…

MALICIOUS

PDF

79.8 KB Created: 2021-05-19 17:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2bff5fa24c34479ce62a73e706347d55 SHA-1: d331131fb6c03b97c9c0c845b63087d0e0e9eabb SHA-256: 8e66d5d817c27c95a5cad0ce8555b7c6091aa320313263760013bda57c3dab59
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into clicking these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kuzutuzo.ru/strik?utm_term=what+is+the+main+purpose+of+traffic+laws+rules+and+regulations+lto PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fe1c685a9df1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_600ecd8baff9d.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/6875544.pdfIn PDF document text
    • https://tazesudi.weebly.com/uploads/1/3/0/9/130969012/litir.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/fozuripudedulalok.pdfIn PDF document text
    • https://patobusogeziwe.weebly.com/uploads/1/3/4/0/134096506/d2051e0ca3c4e28.pdfIn PDF document text
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/6fa36ddeb8424.pdfIn PDF document text
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/xurarigavek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_5fe8a6ab38ca2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527237/normal_6002742e43ca2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fdf2ef24f540.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/zavabakuvasazirevig.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/fugudidetel.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/6878f49d-7d92-4f97-bf83-f1fccc3b6781/what_essential_oils_are_good_to_relieve_stress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7160e0-cb79-410d-bad9-92e8fcaceb4a/xijinejumopolulojelima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d846b82c-eecc-41fb-a114-11d33ac94331/8182648671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3519129b-91e1-4cc9-a81a-68a0ed34b321/sisalinajarapedosexedivop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e7bb23-9ea7-4e51-800e-d558d91f5936/a_company_sells_merchandise_to_a_customer_on_credit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc30ac7-12cf-4572-b4cd-fb0e04e07cbb/dadelawolunetexu.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_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 5676 bytes
SHA-256: 92070964025e5265cd4c6676c45b06354c784c1771cc95cdb7f26a6914d33ae0
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 10784 bytes
SHA-256: d24132940a2d58fc4f2035db32759659cbead4f7602600b8305d70d70fc1b0cf