Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb2a1f619b3db34…

MALICIOUS

PDF

86.2 KB Created: 2021-03-28 02:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 108f410ff817b94cc70b79d8e2c205db SHA-1: 9f68958110868a5bce1f6cf798428ef2f557effb SHA-256: dfb2a1f619b3db34c58c5a620760ee549e93c7139af70c664a9b35820134bce9
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating a link farm or SEO manipulation tactic, and is flagged by ClamAV as a phishing trojan. The embedded content, though heavily obfuscated, suggests it is part of a malicious scheme. The presence of external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://ponafet.ru/award?keyword=heat+treatment+aluminium+alloys+pdf PDF link annotation
    • https://cdn.sqhk.co/luwesefizi/goihihq/42697308834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_6002d620d439b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_6026597a07ced.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/349871c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fdae89f5f4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fd60f844e15d.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/eighhRs/devusugaramadegapatapesid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_6032d58012202.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/Djejigc/luresegedifiridarefin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_60594f9650c2c.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/moxazonumowaguv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_5fda1dd790dc3.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/e0sjij8/vintage_racing_jacket_for_sale.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/24d0aeb1df5.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/d514fdb.pdfIn PDF document text
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/jexixafomaxos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fc85a6c9de49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5735b3be-478c-4078-9259-dfc8bc1bfd33/drawing_lessons_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab9fd90-9400-4dea-be9c-5ea8bc77ae7d/short_paragraph_on_dog_for_class_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5da83df-15b9-4e38-853e-290403338873/dujajisitolejaxi.pdfIn PDF document text
    • http://pimewitonuro.epizy.com/cash_flow_statement_problems_with_adjustments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff91989-a8cd-4f1c-a955-50945e6c4483/download_playboy_carti_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f211c2-7394-4abd-b2ea-7abbfa8a0c96/7955961015.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_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 5248 bytes
SHA-256: 16d6a4653ce36e36ed003ed9a9c9792f485dda689657c0825448cdf335e9aa88
font_01_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 11840 bytes
SHA-256: 9e0fd296fa55b39078bb3bb5f5bfe5131d399499d3f19196aa454ed2f515aab4