Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18e25e6545104f7…

MALICIOUS

PDF

78.6 KB Created: 2021-03-01 16:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 23dcc7d6f663dbbf2dbbca5c29d69392 SHA-1: bde728b6338c43a6932bee138b790f080b00e9c6 SHA-256: b18e25e6545104f7c09e670a1049164424c160c6608c2ee5418fa7162fd915d2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=a+guide+to+deduction+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373261/normal_60385a2a4dffc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_6001cef741650.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/dibigUj/netflix_account_generator_download.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/2252531.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/gehfMhc/lopuw.pdfIn PDF document text
    • https://cdn.sqhk.co/dazulegug/ljgNoid/lurudomusojogibuparatan.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/pavisakupul.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/crjFjib/kershaw_pocket_knives_with_clip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5ff9ac30c3135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_60248f8fe7811.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/lexus_rx_350_review_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/7jdDLHv/57793456971.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/02114.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revulagolorer.epizy.com/bijowuborifanarug.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/30665902663.pdfIn PDF document text
    • http://fefugadabojenip.epizy.com/suzuki_bandit_600_workshop_manual.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_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 4784 bytes
SHA-256: b5b8752052f57725e3d445b316536eb52967b0b35b3c5617839190f7bc1cd4d2
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10412 bytes
SHA-256: b74f19134db8a18037ef9e16e4e9d28fd7b27a879393327def119134e02cad97

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