Malicious PDF — malware analysis report

Static analysis result for SHA-256 61877f693949b0a9…

MALICIOUS

PDF

74.4 KB Created: 2021-06-10 16:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 24c4b421a86ef48fdbb2b668384b9579 SHA-1: ec465876362e3a12acc0e0d93076fa8b4c06435f SHA-256: 61877f693949b0a9facc6b80279bd8f2bc049d83f3fb98f347e92136d7c22c21
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The presence of a URL pointing to 'oniceh.ru' with a query parameter suggesting 'free robux mod apk 2021' strongly indicates a lure for potentially unwanted or malicious software. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/pbw?utm_term=free+robux+mod+apk+2021 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5ff59d874d2c1.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/be5af8bda3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372972/normal_5feafd1c262ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_60bfda5f234e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fe7968fb50e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fd15a0a8a765.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367911/normal_5fe4d294b42db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_6058d338ed99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_605858d3073f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5fc9a3a7e0ca0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5ff802651fa8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff6bfd666a27.pdfIn PDF document text
    • https://sixijuzenej.weebly.com/uploads/1/3/7/5/137513745/73e8a566f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410953/normal_5fe5d21a9c083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff450a6746fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_602e7265ea047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5fe6e36b99d52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd92e5b65de3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fc745f7367d6.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/3f2462f2-636f-479a-9005-ee0d2e7578e7/68632089919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cba504-4bdc-47ee-8313-b46778ba2c6a/write_a_report_on_road_accident.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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 5448 bytes
SHA-256: 7359fb3bb5a174dcca83fa568f72b4fe3c44cd2a1ba5eaf3df253b0f9a2f5aa7
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10532 bytes
SHA-256: 7b40c6bd4071f2ba5758f84d6b1f340e81cb8b21b004fbc99b068b598477dc59

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