Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff5d8d99a41e0b9…

MALICIOUS

PDF

85.4 KB Created: 2021-04-08 04:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dcf25cebba90792912d8f57593193dbd SHA-1: dba2e015874cbb365bb292231ab1eaa94268a019 SHA-256: eff5d8d99a41e0b9f39b1d8d8943ea650553941252f91d24bfd22fa96ea6bb43
284 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's likely a phishing or malware delivery attempt. It contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Unturned military attachments' to encourage link clicks. The presence of a password-protected archive lure indicates an attempt to bypass gateway scanning.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://yafferge.ru/wix?keyword=unturned+military+attachments+id In PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/rugibexavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_601d125ec563b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_6009318693836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5ff8627f63c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_605d7d0eece28.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/makigozud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_601e5132d78a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5fdbdc533f325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494136/normal_5ff7e55304adf.pdfIn PDF document text
    • https://zaxonuwikujad.weebly.com/uploads/1/3/0/8/130874627/xikefopefuza-gobumi-laxekuxubodepuw-tusapalavodup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_60264d5293a3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5ffa04a0632b4.pdfIn PDF document text
    • https://vimumigejanamim.weebly.com/uploads/1/3/4/6/134619591/wipovopulisogo-wirudukiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_60001149e9a74.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/pofadunarexoj_milavezugaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/camilla_kaftan_size_guide.pdfIn PDF document text
    • http://joxamemi.epizy.com/98353998919.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/dozobow.pdfIn PDF document text
    • http://wemitagokodunes.epizy.com/acidemias_organicas.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_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 5272 bytes
SHA-256: 6062869852cd966c86ac57a693817a40153a43d9275dade8490ea428d9d96145
font_01_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 12820 bytes
SHA-256: 770e0621f534970e4a811b382bd8ed9dfff5f417c89248dfe1c92c65237432b2