Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6375c08ce653f7…

MALICIOUS

PDF

70.5 KB Created: 2021-02-21 02:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db72e261c670833a6499f45047bfe345 SHA-1: 25722b548c25f55133083a28c7faba5651a0c69d SHA-256: 2c6375c08ce653f76ed4ea536a06a5670a79e1e2394c97956249ae6a826fb8aa
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 of which are SEO-optimized, indicating a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=colt+diamondback+owners+manual
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd73b258ef88.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_6026ef1f32ec4.pdf
    • http://jalogeteka.iblogger.org/kubernetes_deployment_volume_claim_template.pdf
    • https://cdn-cms.f-static.net/uploads/4476146/normal_6019c6ed1a362.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd13a85e832e.pdf
    • https://cdn-cms.f-static.net/uploads/4416935/normal_602a0e2573003.pdf
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5fe3a1ac4a870.pdf
    • https://cdn-cms.f-static.net/uploads/4502436/normal_600dff6c432c1.pdf
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60232c78c4447.pdf
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/raneradigupo-mopanulisanaf-koxekojorogosak.pdf
    • http://look-hotel.com/10846632252ibdmr.pdf
    • http://trikotoria.ru/61393925165p0a80.pdf
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fcd5fed914c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sevoga/full_metal_jacket_opening_scene_haircut.pdf
    • http://gizogebinide.rf.gd/climate_definition_geography.pdf
    • https://s3.amazonaws.com/biwubeleba/body_parts_english_worksheet.pdf
    • https://s3.amazonaws.com/vinejivunitego/rawutoremapo.pdf
    • http://jupilabezisetif.epizy.com/tugisomi.pdf
    • https://s3.amazonaws.com/fewunadupop/madden_20_ratings_spreadsheet.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_off0000d6c3.bin
12aa3ce384047df6de54cf33fc1f95418d207b9fc57aa571323bbe75f9b000ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 5284 bytes
font_01_sfnt_off0000e8af.bin
26531bdcaca890ee14ae41e2947113a4c6efafededdb1a031894f55edeb7b6fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 10408 bytes