Malicious PDF — malware analysis report

Static analysis result for SHA-256 c247f99cb6e65157…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 18:38:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc821703ab8fc6d096bfdb5c1736210a SHA-1: 7d576c5d3ad30ee3067aa9fb69f483cf8afbed18 SHA-256: c247f99cb6e6515703cd4f616c77aad4823cf5fd41f3f30e487b3942b1f2bacd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a "PDF_SEO_LINK_FARM" heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=carnage+marauder+guide
    • https://cdn-cms.f-static.net/uploads/4454550/normal_6011525ccc873.pdf
    • https://cdn-cms.f-static.net/uploads/4417834/normal_60260cfef37da.pdf
    • https://cdn.sqhk.co/tipefimex/axZjfjd/medical_assistant_jobs_near_me_part_time.pdf
    • https://cdn.sqhk.co/kotolodegag/lDcjdib/zozarajapewezuxud.pdf
    • https://japujavawewiri.weebly.com/uploads/1/3/2/6/132696154/1857431.pdf
    • https://cdn.sqhk.co/bomunerafoju/ihIjegi/approach_to_patient_with_abdominal_pain.pdf
    • https://cdn-cms.f-static.net/uploads/4479462/normal_601613ae3765b.pdf
    • https://cdn.sqhk.co/zobazulibes/hbjejbM/vuluxirulo.pdf
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/1e5e02b0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/werowibovezoje/61736867137.pdf
    • https://s3.amazonaws.com/kewakuko/66496834072.pdf
    • http://turitize.rf.gd/saudi_hypertension_guidelines_2020.pdf
    • https://s3.amazonaws.com/lusabifef/10185012270.pdf
    • http://medetoti.epizy.com/mipulerirutoros.pdf
    • https://s3.amazonaws.com/davolazupivowi/mubagugizugerawefufanigu.pdf
    • https://s3.amazonaws.com/takateg/cadillac_xt5_2019_manual.pdf
    • http://digotadegijo.epizy.com/25162191485.pdf
    • https://s3.amazonaws.com/salade/92395939311.pdf
    • https://s3.amazonaws.com/jimugivos/authorship_scientific_papers_guidelines.pdf
    • https://s3.amazonaws.com/ponivotigegepub/lujejax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c1.bin
76e317b8f807c3d15fe5198a5a93fe8fb36dd68dcf7631a7a2ac920d59e8c160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 4840 bytes
font_01_sfnt_off00010416.bin
090ed191c2242ce48ebcc7d853f5a42d6af71a25ba440d229efdfdde4676fcae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 10840 bytes

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