Malicious PDF — malware analysis report

Static analysis result for SHA-256 f227f1ef29ac76e7…

MALICIOUS

PDF

75.0 KB Created: 2021-02-22 21:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ea7845ec2e7224aec41d0a4f6bd38377 SHA-1: 603c44185ec80f25cc927370e175448080ea4426 SHA-256: f227f1ef29ac76e7a2c53bca2331eacaa0ff5cd391b9a6f6555baee3b5912027
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated content, which is characteristic of SEO poisoning or link farm tactics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/123?utm_term=how+to+put+together+a+3d+crystal+puzzle+owl PDF link annotation
    • https://xubegiwemaf.weebly.com/uploads/1/3/5/3/135308842/23624.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/MrYbihI/bike_ride_london_2019_route.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/6286329.pdfIn PDF document text
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/rilawepoba.pdfIn PDF document text
    • https://sisajubiji.weebly.com/uploads/1/3/0/9/130969075/duxokilulerili.pdfIn PDF document text
    • http://mybatut.store/resident_evil_3_2020_guidejct9n.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/hfpjmjb/xegixobaxi.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/dovuzefamogizaroxu.pdfIn PDF document text
    • http://rasprodavaika.ru/26225238663r1l38.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/2269839.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/4cecf4.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/rizijubovapuk/3425439084.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/59145884625.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/48305973642.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/regobamisoxaxukuluz.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/template_powerpoint_gratis_presentasi_animasi.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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5704 bytes
SHA-256: 54fbed9787e12c0c23b7e454d86ad1379c3ba1b90a69a019de47c125a5a155b3
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 11048 bytes
SHA-256: 37ea8bb82ea5e8126654219428afbae45199ff58e9dccdc9f6b4b1290a0065ae

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