Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d86078edbc635c…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 06:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a032a6135575e181c39db86807f8c7ac SHA-1: cebf35f95609a3d756fa7502884d8b24aec211e2 SHA-256: 25d86078edbc635c3c67951cf06c84355e1e98c901d4f659ddabd3c04e26f3c9
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to "Casio g shock solar low battery indicator", likely to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=casio+g+shock+solar+low+battery+indicator PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fe6a092b5cc2.pdfIn PDF document text
    • http://koolmaxt.online/wugejisufawesint5peu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393752/normal_5ff3743c63fce.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/cJIjiej/21863588979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ffda8e74195b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450746/normal_604404ce3afc9.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/IQhjgiH/zinajogerino.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/8hbihqC/dujosovupawomade.pdfIn PDF document text
    • http://sushibara.net/the_road_back_to_you_test7vqri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fe1142f78450.pdfIn PDF document text
    • http://construt.site/powers_of_the_psalmslaoxm.pdfIn PDF document text
    • https://cdn.sqhk.co/kobamebexog/Jd527hj/whatsapp_business_apk_download_for_desktop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_92893b89e5d2441bb9bd56be04ddba41.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_cc6c43e0cefd4801912a76ba63bcce61.pdf?index=trueIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_86136e38d8ed4b01985e0f6cb8353ccc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d363784f-98db-4a25-94dd-d14b5e596be3/how_to_load_a_bobbin_singer_simple.pdfIn PDF document text
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_deda472ad11544d8a35a17262df99846.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af51b300-899a-40be-96c5-a3c5a81526dd/moog_sub_37_techno_patches.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_9e3a518e76ab40f881b7cc7d8f21df2f.pdf?index=trueIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_7edfb3bb6d9745fca693605b6bd79e4c.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_6b3f2eeddf7a4f3ba892baa5c93df8bf.pdf?index=trueIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_d70a7b527ac14aa4a2bb8f8be212e52d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f398636-9151-49fa-8b52-6f95eece1169/63511882834.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 5504 bytes
SHA-256: 67dea4258458b6bf5b97de3d8a1016086bec9c123ec1c6ec6847536d41a7083d
font_01_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 10600 bytes
SHA-256: cb0afb5b21d092408f9051aa44633973a56dd623590fe379078e9021218b591f

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