Malicious PDF — malware analysis report

Static analysis result for SHA-256 35abac6a9e49894f…

MALICIOUS

PDF

98.3 KB Created: 2021-02-08 17:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 56094b626b7f581d385e856a71270e49 SHA-1: 52db7d8843507e3b5b48346921c1e8a383744342 SHA-256: 35abac6a9e49894fccaba47bd2d6f5f7185c76b7ff83cc59a3289c3c1ef73f86
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', potentially indicating the tool used to generate the PDF, and a URL that appears to be a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/aws?utm_term=gif+splash+screen+in+android+studio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5fd7afd9bc7ef.pdfIn PDF document text
    • http://milanomoda-italy.website/free_rock_ringtones_for_mobileot2l8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_6009fb8c730c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_601582aaa718f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_6008c81cc6f12.pdfIn PDF document text
    • http://potoborotagivud.22web.org/paliravagozob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ffc8f1bcc6fa.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/jamuluvuvava/ata_guidelines_for_medullary_thyroid_cancer.pdfIn PDF document text
    • http://molodetagako.epizy.com/ximasuje.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/fitosuma.pdfIn PDF document text
    • http://vatasinunevuto.epizy.com/ariston_dishwasher_lkf_720_manual.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/vuvamopusawegegipejamego.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/56804645503.pdfIn PDF document text
    • http://bibarixe.epizy.com/84087324097.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_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 5272 bytes
SHA-256: 2503b7be7664006814bfdbba8907693839674f467e2def2f9d804f591818a535
font_01_sfnt_off00014cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFC 13732 bytes
SHA-256: 6508cf9d4a800185deee05a59e0ba206c23829b1b31929866c8a546f0ddb725b

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