Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9072c770ee91d1…

MALICIOUS

PDF

92.8 KB Created: 2021-03-01 01:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2d1f58e41dd3deab933ba1f4593ce46e SHA-1: 9021bf3ba8e6c53ad1345843bc4814b444e3395f SHA-256: de9072c770ee91d183c5392548b868b06454f1aac2da77a39f77256f8b3244e6
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 designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=wings+of+fire+graphic+novel+3+pdf+download PDF link annotation
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/005598a4b2.pdfIn PDF document text
    • https://lomivatixipe.weebly.com/uploads/1/3/4/6/134673305/bimepajimidev.pdfIn PDF document text
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/tevupet.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/9286260.pdfIn PDF document text
    • http://idealicaitalia-official.site/4fun_app_downloadyz43g.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/mogose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fd1c81a81aaa.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/98707170796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_5fd6459c79790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fdaef8b50e0c.pdfIn PDF document text
    • https://vemugalibi.weebly.com/uploads/1/3/4/4/134484787/a5b5ce7507a28.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/wonenezute-fomudonudolile.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/the_devil_wears_prada_streaming_australia.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/senodiw/dilemexiridolulunadorub.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/what_is_the_highest_paying_job_in_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/95198364281.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_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 5744 bytes
SHA-256: 39efb4926b67fbfee29f02313098336de28bdc244f2410b6d94966df176966c9
font_01_sfnt_off00013b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 12760 bytes
SHA-256: 267f26cd24db9d632cc982c1ac3013b6c67445128dac9089cc13da999ebab634

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