Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedbec69c6998c17…

MALICIOUS

PDF

65.7 KB Created: 2020-12-16 21:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6b702b6ccc0967afe8b4e4a88ac5ec10 SHA-1: 179fe6a7fdf5a394d1a770ddc2c12510dd189b4d SHA-256: cedbec69c6998c1769d196128ac0db72c40d8f26fd6a5e55f997f154983ce2fc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or a phishing campaign. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt 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://trafftec.ru/strik?utm_term=printable+map+to+label+continents+and+oceans PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f88910d71228.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/2c169f6c3cb6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fc2f998db7b9.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/falevi/50413824378.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/artioscad_training.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/52407952667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c70b6d6-03d9-468c-ba8d-0b3aaae68244/34029924397.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/healthy_vegetarian_diet_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/43035376684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38fb03b-4f3c-42fe-a235-cf3aed4ca1b9/laser_sight_for_glock_42.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/lapunidetupixora.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/57746130193.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/nakoniret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e0e51d-3393-4c6c-bbb2-c60ba2429dab/poisonous_african_snake_3_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/blue_cross_federal_medication_prior_auth_form.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_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 5360 bytes
SHA-256: 0db9294c5eb4d38f43ec94257b129fc99fe83ddae89af73b7936fb1247730c14
font_01_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 9640 bytes
SHA-256: 3a77da4038ee4ded23e04d39ddfd46db60fa9bed632a8faf124ab9461f6e93e7

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