Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e1a9d446546f40…

MALICIOUS

PDF

79.0 KB Created: 2021-03-01 08:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1fc7fb93e5446fa3de8402559d4eb9ec SHA-1: d9feec0257cd33ca00c52c333c3f1161ead1cf8e SHA-256: 33e1a9d446546f40bd7ee7a80d5a33ea8f0b41e2acd97df300481899720a5d00
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, suggesting a phishing or content-scraping attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites for further exploitation.

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://ponafet.ru/wix?keyword=motorcycle+scan+tool+master+kit PDF link annotation
    • http://subfamjtii.site/hp_envy_4500_black_ink_cartridge_problemzy4v1.pdfIn PDF document text
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/8613601.pdfIn PDF document text
    • http://sberbank.services/shark_water_slide_rental_miami8zfkd.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/53679fb88fc14.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/755409.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/68ee13.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/1344736.pdfIn PDF document text
    • http://monongzhlh.space/samsung_warranty_galaxy_buds_plusfq1y8.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/proctor_silex_rice_cooker_37531_manual.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/jolozidabi/fumenubuzewaxev.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/xezug.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/mubixuxajujabogup.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/bluestacks_for_pc_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/baiada_annual_report.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_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 5116 bytes
SHA-256: c88ba2e5fb49f7941c82aa5b50fade098f90166c62cb24559f56bd7588ab8ba9
font_01_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 10548 bytes
SHA-256: b75e6446611753d62bc7a3b93f9bee90d796925ba646804af54f6ede61929ea2

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