Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ec99bc1d57bd71…

MALICIOUS

PDF

75.6 KB Created: 2020-12-29 16:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 885a153b2780ce005774c5a1fd9a38d1 SHA-1: 996cfb02ef582baa792b08bd481e06d77558ed46 SHA-256: 82ec99bc1d57bd71344a5bd281d9a300c8cf2c9de5aa71e2cc5183f524390822
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, a common tactic for SEO link farms and phishing. One prominent URL, 'https://trafftec.ru/strik?utm_term=online+bidding+auction+near+me', is likely malicious and serves as the primary lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a malicious intent to drive traffic to potentially harmful sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=online+bidding+auction+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402717/normal_5f9661a560379.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/8689160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5fe769d9559d9.pdfIn PDF document text
    • https://kipuveleg.weebly.com/uploads/1/3/4/8/134851645/kejenebinonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5f947a02489fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_5f9cf66405c73.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/kibixuwizeki.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/bbe744bc-056e-40c1-a2ba-e1c7d0657e10/53588352841.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/stranded_deep_trainer.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/56404498389.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/bullet_force_hacked_apk.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_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 5248 bytes
SHA-256: 8d985340ca66574be04730bff6035180a27ea640e4a01bc9521a2bbac5080567
font_01_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 15868 bytes
SHA-256: f6c30244aac700bc1e4e56981ba78d29fa85aa4417a4e3360d5150fa236ad944

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