Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5aeb267fd58c14…

MALICIOUS

PDF

70.4 KB Created: 2020-12-23 20:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c8b58f70aaa503fecc9ff129e713b0ab SHA-1: bfc9a515ab3501c9088a0f0a6af9291e61444d1e SHA-256: 1d5aeb267fd58c1493295267c5595a96b809f92be5b2a8970d32671c48fb4d1d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'trafffe.ru', indicating a phishing or redirection attempt. The 'PDF_SEO_LINK_FARM' heuristic firing suggests a large number of generated links, likely to obscure the malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=precast+concrete+design+handbook+pdf PDF link annotation
    • https://cdn.sqhk.co/mokavokaven/jjicuid/mokotugi.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/4561170.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/jdsQlif/30492732536.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/sekogasilukotulisa.pdfIn PDF document text
    • https://cdn.sqhk.co/wukibezoso/gfIifjf/94045968486.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/tonemakopinibem/lightly_row_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/xeximejakenimozafedujogex.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/rewunuref.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/76275155209.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/blood_diamond_ost.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/hello_richard_clayderman_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/calendario_biodinamico_2018_espaa_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/34217028133.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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 5376 bytes
SHA-256: 43cbec79025d4969552e851d7196f714848d85638fea83e08a9f46cba8030e50
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 10744 bytes
SHA-256: ab1b6b844d427ce56d5c10997ce2645ed548f34309111a446ac0b0dac9f1c01a
font_02_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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