Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc3d67b3d6d4040…

MALICIOUS

PDF

71.8 KB Created: 2020-12-17 20:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1dedd3f8857c6016589dfa724739d69c SHA-1: bff83452ae72587411035f0393279c27d57c1c4d SHA-256: ffc3d67b3d6d404022ecd7302307cf385b81bc734e32cd6ce51ca254dec5908a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=gta+san+andreas+weapons+map+los+santos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fa4ae48e4dbc.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/6805203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f97d6a899413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5fc3e2b90f24a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5fa359d28393b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc77f0702915d4a16f8d210/t/5fccac9beb18547f4b80a40a/1607249054347/33478063280.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eda3ec917750a3d80aaa/t/5fc16cc9fa04221c715577dd/1606511817771/cranial_nerve_assessment_slp.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc066c960f2895dc1e54813/t/5fc472e3a97599144e87446b/1606709987773/9851563865.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1ca817d0c8f249d471d79/t/5fcec098505b451de177b8ad/1607385241341/76184032385.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc676695e8e827d42b421ad/t/5fd71855481cfa31ade00735/1607931990816/17214913361.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f06b104edf1d7780fa74/t/5fc14deefa04221c71500725/1606503922646/f_girl_names_hindu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14d4c5bcb0228a2853727/t/5fc4a9e62dd96f5918818d21/1606724074455/vedugularunev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553bcab79f442f246f04a/t/5fcf64c901eaf4591e28fc33/1607427274571/a_vocal_coach_in_egypt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 4968 bytes
SHA-256: 3cec4a8a19dd3a4b5bc70cd84d6c3aac32902cc0c7562599b3de81da0fed4873
font_01_sfnt_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 10176 bytes
SHA-256: 4d328b1d4968fab120a813b03a27d20dc343a7c9c968641788821fc4972ff069
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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