Malicious PDF — malware analysis report

Static analysis result for SHA-256 d961dde813b930b0…

MALICIOUS

PDF

69.1 KB Created: 2020-11-25 21:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6dcde6ce0b83d33813429fca985dfe28 SHA-1: 2f1949e5021f1b1c0121d37a7dadf6a8b91a9170 SHA-256: d961dde813b930b0500408a962a06966400430d6f05a9e1825cc53bd663b0729
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=difford%2527s+guide%2527s+top+100+cocktails PDF link annotation
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/3690598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_5fb38f2ad50d8.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/sifawekujiki/fevalatamugorogorewoweve.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/mivoxunibiguwaroda.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/counting_atoms_practice_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab09521-8d3e-4504-9ef6-8f38e4f0a6b3/chemung_county_sheriff_pistol_permit.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/point_of_concurrency_for_angle_bisector.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/39650932901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63da4657-abe3-4c10-8e95-dcf8b4a86d63/nowiwebidopofeve.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/nelovebivevufivapop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68701978-9fea-4c1b-ab15-7904beb9ef9c/vudojuduxekukakepo.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/elite_fitness_inversion_table_9300.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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 5612 bytes
SHA-256: 941262a25787fbaa75841dc6f85905423a16bb0e137a237ed1a9b8a8533a2298
font_01_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10816 bytes
SHA-256: dfd6c4672f3e078ed36f16b692374e4a1f42c07fe1cf56f942afac60766696fe