Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58b29b808ec062d…

MALICIOUS

PDF

59.6 KB Created: 2020-12-20 09:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ae3b0039e4246c43cd33868f3d337b9e SHA-1: 1d7fa2b675efcd49a4e84a16b8c626d7aad90d69 SHA-256: e58b29b808ec062db01cdf77150dd7bf79b5dc3ee122702cafec7d748a02d6fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF's structure point towards an attempt to exploit users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/strik?utm_term=old+feed+mill+current+auction PDF link annotation
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/dowafotomiwi-favamuw.pdfIn PDF document text
    • https://bavifogo.weebly.com/uploads/1/3/4/5/134524367/lutifuritunupusom.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/1260789.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/roditapusiluluxowef.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/392592cb2e4a00.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/naxif.pdfIn PDF document text
    • https://wepubimixojipo.weebly.com/uploads/1/3/4/5/134584552/bewatojigaro-javilevebisin-konelu.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/487eb17f-f7a1-444d-bdb8-072eed2392ba/fojotiwewakijoxegaw.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/kibajeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9ce540-1839-4f1b-b918-a38b495ac4e4/wadeta.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6ed5bbcf5f06bcb75bdda/t/5fc8a8218bd7793567567d44/1606985762431/holy_roman_empire_map_1200.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_off0000ac75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC75 5016 bytes
SHA-256: 1586231ace7bd9810ee6dcab23f09c0b683c419c1739deb97d5986ee396c4670
font_01_sfnt_off0000bd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 10780 bytes
SHA-256: 534538f29277f4d3ae79f35544651bbfdc94618b168759588912e8988cc95706

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