Malicious PDF — malware analysis report

Static analysis result for SHA-256 e879a6ca61bb93fb…

MALICIOUS

PDF

71.4 KB Created: 2021-01-19 22:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: dfafe6a469cc6db48466740d1219c1cb SHA-1: c0776212ba29fb7608ae807045da8577210de462 SHA-256: e879a6ca61bb93fb0047f309520512c2f7d7d7a37df35125ab69481a8aaa4791
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://traffset.ru/123?utm_term=sin+city+deciples+property, is flagged as unknown reputation and is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the link farm suggests a potential for JavaScript exploitation within the PDF.

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://traffset.ru/123?utm_term=sin+city+deciples+property PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f92f4461fd5c.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/xubogipedotiban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5fa395d7e4461.pdfIn PDF document text
    • https://vujaroroxino.weebly.com/uploads/1/3/5/3/135314625/borewubel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fed30f2d373d.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/UmnCPT4/ralph_s_restaurant_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/iahgwie/bovetejivugamolovuv.pdfIn 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/xonaxevetaf/rizud.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/elizabeth_olsen_family_template.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/15168890337.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/73821854302.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/peremipalogi.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/81325273928.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/48025991668.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/flames_drawing_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 4848 bytes
SHA-256: c5e47663156d49ff9abc5a50ad8fc133f4826b7f313271ca078a00629f2401ef
font_01_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 10796 bytes
SHA-256: f0ad207b08e3ba1a6ddcc5986b91a7aef3cb90f4355a973d861b38958f64cbbd
font_02_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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