Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77bdbabd16607e0…

MALICIOUS

PDF

75.9 KB Created: 2021-04-19 06:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e1b4c3e0195e095cde7c6b33620e5547 SHA-1: edd0be1016477ed9260d090ad99a83419d0170b4 SHA-256: f77bdbabd16607e0d8f5ebbdd31612c3111fffb252c3ad5587f8cbf60d2efaad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. The document body is heavily obfuscated and truncated, preventing a clear understanding of its specific lure, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=how+is+god+described+in+the+bible PDF link annotation
    • https://cdn.sqhk.co/dijexovesaf/7d5hjfL/13157829503.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/747084.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/misomanolukixim.pdfIn PDF document text
    • http://bloodcraft.online/fezizidxozka.pdfIn PDF document text
    • http://tb-films.ru/pipixijetijasuc3dp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_5fc573b452b15.pdfIn PDF document text
    • http://moresukko.ru/bon_appetit_chicken_meatballs_sheet_panrqhjd.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/5015676.pdfIn PDF document text
    • http://eurostore.info/mivonukudim0e4mg.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/vifikobimezip-xubarapanokakuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_605cd5f0ad0d4.pdfIn PDF document text
    • https://tebojizo.weebly.com/uploads/1/3/1/4/131406069/kirisufalefutufom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_606b827d82e1e.pdfIn PDF document text
    • http://hookup153.fun/58075519304l1le6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_6045aa55698ec.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/fLjcChe/watch_youtube_with_your_friends_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_6041312f86ef5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_f9b3bbf57c0b406f9db90438e4536b70.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_d451b791bf094021b9ac389094757587.pdf?index=trueIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_41bb23c41c694d87a7ea6b6fb281238a.pdf?index=trueIn 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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5184 bytes
SHA-256: 73d8984ddab23e449d822d1015d941db4f8482db539698544cfbab0d6560c270
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10792 bytes
SHA-256: eb10b8499aba71434f5fbab95a6d1792fa90ce62da34ab8812218664de1e6414

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