Malicious PDF — malware analysis report

Static analysis result for SHA-256 a681943b6bb5dd67…

MALICIOUS

PDF

76.0 KB Created: 2021-03-01 23:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: f3668e8d94f00dd7aa034371fa88d478 SHA-1: aa2b92352629760a20f153453a09a8475c14ae39 SHA-256: a681943b6bb5dd67bd7dd2da042c3f9ab886dc10c97ec44a65b4f1fb8cf1f82b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or spam document. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, appears to contain keywords related to search queries, reinforcing the lure strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=are+alesis+drum+modules+interchangeable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452398/normal_60343316221bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_5fe7d29acb146.pdfIn PDF document text
    • https://mokasinerosun.weebly.com/uploads/1/3/2/6/132682676/voded-bulitozuv-kugevomirutijop-kenenawis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_60286cdea29bf.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/a9n5ZRo/72465405888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_601b9310de8ff.pdfIn PDF document text
    • http://nunedosigiruros.22web.org/definite_pronouns_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_600f64ec9d95b.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/d823892dc7a.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/TihfFie/bepimevafolanibiba.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/piiB7gj/29330138369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_603138ef005d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_6007ca7444d74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_603aa015020f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://didazejitikav.rf.gd/ambedkar_books_in_telugu_free.pdfIn PDF document text
    • http://mutodilevo.epizy.com/ariston_washing_machine_manual_av61.pdfIn PDF document text
    • http://luxibidolukaxuf.epizy.com/where_is_the_goddess_statue_in_gerudo_town.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_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 5484 bytes
SHA-256: 9c70c8dbd3215739ef56926cba809accd6292ec779c6a0857b8d6a209edbdf54
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10240 bytes
SHA-256: 2bae539402d960f5f60bc9ba5174825e311e9fd4cd28166a0268e1c5a0bb4649

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