Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4a2dc18191f62b…

MALICIOUS

PDF

77.7 KB Created: 2021-04-24 05:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 11690215df43e05dbe3e79f8d9e750a4 SHA-1: 04cc3c8513056edf3fefe8865984fee13508e787 SHA-256: de4a2dc18191f62b6960def6733233bd609c08253567eaced175a18667347e9c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://botokaw.ru/strik?utm_term=instep+take+2+bike+trailer+reviews PDF link annotation
    • https://sitavekoked.weebly.com/uploads/1/3/5/9/135974486/8202358.pdfIn PDF document text
    • https://rovenefewapug.weebly.com/uploads/1/3/0/7/130775308/5552802.pdfIn PDF document text
    • http://verifybadgesbusiness.com/auxilia_clube_assistncia_tecnicapq1kj.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/haahiji/73073272936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_606ace69f16b0.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/QictpJ1/75506244748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_603ac0a1d446d.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/eXTLLhd/train_sim_world_2_roadmap_october.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5ff88e0234571.pdfIn PDF document text
    • http://online-sistem.site/66607360930ekvnf.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/4f2e391b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/icygghf/42253602924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_606b44c0e8d55.pdfIn PDF document text
    • http://zubosoxi.22web.org/75888159710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gojetovumivet.epizy.com/sony_camera_4k_apk.pdfIn PDF document text
    • http://xigofopaxedu.rf.gd/9234807343.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/aha_asa_guidelines_subarachnoid_hemorrhage.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/ontario_executor_compensation_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/98856018712.pdfIn PDF document text
    • http://vazorilumi.epizy.com/23205903033.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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5240 bytes
SHA-256: 8ac24e7e7dfa691353996d694a0f6ab48d8a7220ad263ba17a843677d8b70055
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10936 bytes
SHA-256: caeb5a06e9065a0d512cce706ddb29bca7ccaaffa9798a2348813d749c3ac2ad

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