Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c09a17a177b03ee…

MALICIOUS

PDF

76.7 KB Created: 2020-11-22 02:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6e04d7b79998e962b7309b9cff52d8d8 SHA-1: ba4cb38d817d8c5062b8342f5870c43f322b3643 SHA-256: 8c09a17a177b03ee34fa04354d517fa952ea5d132fa41a2c6b708d17c5fcc99d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a modified APK for a game, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and linked content suggest it's part of a campaign to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://trafficel.ru/123?utm_term=ares+virus+mod+apk+unlimited+money PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5fb2b97372b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_5fa0e17d5bcdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_5f9928f3be78a.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/kezorawin_zijadi_xadudawepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_5fa47aa3d87aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fb6bd6bedbfa.pdfIn PDF document text
    • https://gefozovunipor.weebly.com/uploads/1/3/4/5/134585144/5306939.pdfIn PDF document text
    • https:///qcplay.helpshift.com/a/ares-virus/l=ENITIn 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://s3.amazonaws.com/sojaxub/the_habit_burger_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/50299313958.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 5200 bytes
SHA-256: 8836a81367603f6965a29cb0fdad6eb4b4d909f4d3158516e4eeebbb79e13583
font_01_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 10996 bytes
SHA-256: b8d68dc823fe1968f324040a2ace225051761e8a2bb510243f2cfde4fb6fc83f
font_02_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 16232 bytes
SHA-256: 6312c60c59b705e9eea0cce2691d26efee8000c36347b0aec776c30464574248
font_03_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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