Malicious PDF — malware analysis report

Static analysis result for SHA-256 3991c6b4e5e2077c…

MALICIOUS

PDF

71.2 KB Created: 2021-02-14 13:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8bfade903ece807dec47ec8bb13e9976 SHA-1: c83e58a52ea45f9fc0e551e67ee6eca8cfe29aa8 SHA-256: 3991c6b4e5e2077c871a0e5215c919b84b6e3f45a8bfa217fa958be92a5502a4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The primary URL, jottigo.ru, is suspicious and likely leads to a malicious site. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a restaurant menu, aligning with phishing pretexts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=matsuya+japanese+restaurant+pretoria+menu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5ffe0986986f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5fcee35ccd2cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcc8c1b3f356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474456/normal_5fe2419bb61a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_601edc4f3c0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5fd93e02937e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_60250a9fc34f0.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/wolubujikuzezage.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/jjx8ggA/51177658588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fcd0b93e4833.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kujesulad/dream_theater_octavarium_full_album.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/83280167877.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/raxerufubazobo.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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 5116 bytes
SHA-256: d3307cfa77c715d1bf6384c3c2e6df2e5077bebb3365be970fa0665d7cbb1007
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 10468 bytes
SHA-256: 52c8b9897abd8872df223d99bd95d8c20c578fe5f4fd6fa7edfd73ddfdadd518

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