Malicious PDF — malware analysis report

Static analysis result for SHA-256 f936bebb75372b81…

MALICIOUS

PDF

92.9 KB Created: 2021-03-19 10:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d61ba6592559bf42b617211d34f786b2 SHA-1: b437234698409ea75d4f621a9451b1f7fc3dda49 SHA-256: f936bebb75372b8146271628afdc6ab15ea97a99d1f0a442675dd8f4dc0d2628
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is vilenefex.ru, which is likely part of a phishing or malicious content distribution scheme. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful content.

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://vilenefex.ru/123?utm_term=capitalist+without+capital+pdf PDF link annotation
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/765fa2.pdfIn PDF document text
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/sasijulekofizul.pdfIn PDF document text
    • http://repair-monokoles.ru/cognitive_psychology_and_its_implicaie53i.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/9068678.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/latixobelekebeboxu6djup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudefem/povosi.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/30040443439.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/best_app_windows_10.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_e6570895c5f74b46bd7ddd85c07add5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabom/62884240786.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_532958fbb03f4508b50c42192e1fb78c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/3636892428.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/cambridge_primary_english_learner_s_book_stage_6_answers.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_813b8b9c30d344a58a2f8ce8b1622472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/dimowabix.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/47814312784.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_4d8b85bfc27246168110a8739791b85a.pdf?index=trueIn 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_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 5144 bytes
SHA-256: 9f3756f4b8e2860be78becfb16e6d4f83364305b96efa392a490f4ea3103ada2
font_01_sfnt_off00013ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBD 11280 bytes
SHA-256: 86a6127b5750096a708c446afdbdad81aa6eb9ca9bfb66ad1b10f717055b71d1

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