Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9de7f73e05f460…

MALICIOUS

PDF

85.6 KB Created: 2021-03-01 23:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f5b4f73069d8fa870b35c1cb2b95b670 SHA-1: 5b04cfd8677561a3b67a67c25ba0fed93071a4b6 SHA-256: 1f9de7f73e05f4609ba32a27439bcf19fa259065282cbbea1355978630b0977e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious 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://kuzutuzo.ru/123?utm_term=can+you+see+objects+in+a+dark+room PDF link annotation
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/17300f48.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/john_deere_42_inch_snowblower_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ffaaf15b0938.pdfIn PDF document text
    • http://sallles.ru/722997744664cs8f.pdfIn PDF document text
    • http://prizinsta.site/430821971989b6op.pdfIn PDF document text
    • http://respect-ltd.su/melevolojupenelixolizul91xb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kilarosine.atwebpages.com/fimimomemovopodulutadot.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/emotional_intelligence_leadership_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/personal_assets_and_liabilities_statement_sbi_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/append_data_in_formdata_jquery.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/71291196607.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_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 5340 bytes
SHA-256: 46d822119759b7accce0b6579c14ba01883e52f60a948bcba5a3cf5d40c0d934
font_01_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 11668 bytes
SHA-256: 9abef50fa166da54d3abf406f18b13d343a9f99e5f942f549053555f55624fa5

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