Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ded5a9f5709b6d…

MALICIOUS

PDF

98.2 KB Created: 2021-02-19 09:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 50a69f67e9205eb8f80aa7986098e8ec SHA-1: 956fbe0bc158cdc0a38cb1113edc6f3a7566a64b SHA-256: 46ded5a9f5709b6d27d73f9c76da99a399b1749836327fa9f8aedd915886c0c1
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to drawing a male face shape, but its primary function appears to be a link farm, with numerous external URLs pointing to other PDF documents. This behavior is indicative of SEO manipulation or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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/strik?utm_term=how+to+draw+a+male+face+shape PDF link annotation
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/703657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6023f2058de3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5ff0982dd5d7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5fe2d0742188a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_602f2fc8f21ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_601ae12a09eb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_5fff147e89e6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421330/normal_5fe1b15ccde2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366655/normal_5fdfccff270b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fd8302e118a3.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/fomowipemal_wuvaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_6013cb0431ed9.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/zuzire.pdfIn PDF document text
    • https://wivoximuvekobug.weebly.com/uploads/1/3/4/4/134473281/4517725.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/sojaxub/dna_rna_and_protein_synthesis_worksheet_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/89534872633.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/34497798130.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/business_plan_template_for_pizza_franchise.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_off000141b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B7 5448 bytes
SHA-256: 5de05e9ce8a4b8e69552de2c71ed1013ff56597e404a4c51544e03966c14fdd2
font_01_sfnt_off00015426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15426 11944 bytes
SHA-256: 5f567ec8f4bc8eced11906f4bec72eb92cb54dfdcf117be21788fdfc61a18520

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