Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcd80b7a7a71789…

MALICIOUS

PDF

74.5 KB Created: 2020-12-17 18:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e0971b745480f3e04ca941b1a302fcd8 SHA-1: 929835ab4e680d4ee22c64b3c0b6c1b3056e04af SHA-256: 5fcd80b7a7a7178969b86d0affeb66a5fe5750c3aa2755ade3db03413cbd0989
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 critical heuristic identifying it as a link farm designed to direct users to various websites. The presence of a URL related to 'friv 1000 games unblocked' suggests a lure to attract users interested in online games. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking strongly indicate an attempt to redirect users to potentially 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/123?utm_term=friv+1000+games+unblocked PDF link annotation
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/62980011.pdfIn PDF document text
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/4333485.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/sanudizupimam.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/c313334bff6eb8.pdfIn PDF document text
    • https://subulutug.weebly.com/uploads/1/3/4/3/134349811/497245de9ba548e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/add23e5d-3c75-41c6-9d53-d3288612748f/kigutuliziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9db50c-26cd-4162-9a4a-ec9efee8e143/talinidopuwezapukako.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc670f98ef7301f8b370534/t/5fc9ea659bc93d20d9b1a40a/1607068261961/gomakilole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a812f7b5-2000-4e4d-bbab-6ffe54fff880/letter_tracing_generator.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d6f9ff13940aa24c3a4c/t/5fc4f7db3570fb44d19edc14/1606744027347/30998502322.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfac679c08c7f2b9ebe2d/1606220486428/87746678359.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1619768612547ed61873d/t/5fc5671118e72e5fdb8dc48a/1606772498237/redstone_torch_recipe.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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 5672 bytes
SHA-256: c933268cbc6a0be885356cde7693f2b80a3a144184baece0167050eb15112e89
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 10880 bytes
SHA-256: 37b2b4fb0274fbe2cee9e8b0b4001674cf269392b5c93e11774489de8e2fc414

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