Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99ea8683b2adb75…

MALICIOUS

PDF

73.0 KB Created: 2021-03-09 12:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 453f46963df137a16b0db2134ef040cf SHA-1: b167dec300f4d30f5aff408845830d6927a9d41c SHA-256: c99ea8683b2adb757d521be55fd29eb40743c9d41f1830829ec600e7907d207a
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of external URLs and the 'SEO Link Farm' heuristic suggest the document is designed to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/wix?keyword=samsung+ln46a550p3fxza+service+manual PDF link annotation
    • http://birjand.design/laponaralodidiberusi2li53.pdfIn PDF document text
    • https://setijuxuzazoba.weebly.com/uploads/1/3/4/5/134500005/vusokin_gigapaginijadop_suxewekadalurop_feduzewimadeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_5fd75e7c57be3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_5ffca98b5ac36.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/what_are_habits_of_mind.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/titawomutubav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd2d8329e28e.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/0bf7f856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_600e75eb54ba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_601cb7589bc1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_6038ec0f4210d.pdfIn PDF document text
    • https://dafebifu.weebly.com/uploads/1/3/4/3/134399244/e09a8.pdfIn PDF document text
    • http://cheapestshop.xyz/23727732085hvmx2.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/5360936390696x2w.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/98080528634.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415077/normal_5fdcf7416288a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_ca9335759e064c6d8008f9289cea3097.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_46194a4337fd4794833742190903606c.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_dcae3b7ffe60435cb85dd0c1bfc9b13b.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_683be0562396423ebd66170f7276c4f7.pdf?index=trueIn PDF document text
    • http://gekolutewubel.myartsonline.com/fatudok.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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 6288 bytes
SHA-256: 5a65de4d5eba09362e0f1f4f3a4b6beade8a6820971b73b3e3623bf8ed3b0a97
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10104 bytes
SHA-256: cc5ee474a86d98da4bf961911daf4cd5099f7af241d6c965eca6480eef353d02