Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e99f891a9388c5b…

MALICIOUS

PDF

67.8 KB Created: 2020-11-14 20:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3cfbd6850ee8c066e9b009971717ce53 SHA-1: d2be8a53e6f17262458c85ca2831ea6f24dc9037 SHA-256: 7e99f891a9388c5bb204100744fe4176acf5077d0f478b3d8b300f212b280786
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/123?utm_term=werewolf+vs+vampire+eso PDF link annotation
    • https://zilasemewoxuj.weebly.com/uploads/1/3/4/3/134318224/9240586.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/0019412.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/roretate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5f9a0cb571ff4.pdfIn PDF document text
    • https://letolonenuxe.weebly.com/uploads/1/3/4/0/134095956/lixofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5fa293c4e1b20.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/numes.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/ceea72bd-fa46-4db5-9186-c07fdde5ac4c/jirijezuloti.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/word_whizzle_cow_answers_african_countries.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/rozagebunobefijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97672df1-48d0-4f00-86ee-d1b85223995f/gebupuruzelukamokiwejisa.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/fanabizuniridavusazubudi.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/95703653414.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/12197454188.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/mystic_skill_guide.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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 5212 bytes
SHA-256: fc198c80eb9da3ddf381fec862bbf3d41ca2ce30c4a11b67238ee43f6d2306df
font_01_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10868 bytes
SHA-256: be4edcf6f77ae83d5ffd2301d1994b2d3b5b76cae0d9a4903d21c80d21486ef1

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