Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a256737fa21b62d…

MALICIOUS

PDF

68.4 KB Created: 2020-12-15 13:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aaa4862e834631cae554d01b6d0b7d45 SHA-1: be71c2c5a68d8f2c425573b899da6aca3d8dc4ec SHA-256: 8a256737fa21b62d8c92b4814d9d846e394e666741fc8731b4cce2bede4aa533
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 as a link farm, with the primary malicious URL being 'https://traffset.ru/123?utm_term=sutter+butte+animal+shelter'. This suggests the document's purpose is to direct users to potentially malicious or SEO-manipulated content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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=sutter+butte+animal+shelter PDF link annotation
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/xibebaje-morebadekedazu-vofubotegisi-notune.pdfIn PDF document text
    • https://sorimuzumetig.weebly.com/uploads/1/3/4/5/134519591/nalimugajenejumarew.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/d8bc13ec3.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/voxexinelosiremejas.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/808b602517b3.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/2456944.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/jebupofedijakuk/fapufonit.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/66635352863.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/53756555407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1958e48d-f4f8-42ce-980e-dc203cbb5b2f/vetupisotepi.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/fenokorobosositetibizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc411ac-b2ad-44ce-ae9d-464fc29c354e/logufowelejirupola.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/fet_datasheet_transistor.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_off0000c74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 5168 bytes
SHA-256: 4a238b14bb84402be50e16441d3b01cb300bc76e7c8056cda18911fadf459c39
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 12796 bytes
SHA-256: cc7fbe8f6c1e37b34acb04b5de419f120fe2f54c97c3e705969bac1d7f3185af

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