Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af92d150e33e71c…

MALICIOUS

PDF

70.8 KB Created: 2020-12-24 21:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9aeac6776f55a3f2cea61edb0e140bc7 SHA-1: dc389aa29d92731fcd1d66449f418461422285bc SHA-256: 0af92d150e33e71c09b5e7dc7983f9fbcb9eb524da87aca6df011c10ab96e419
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=how+to+read+music+for+bass+guitar+pdf PDF link annotation
    • https://cdn.sqhk.co/zujagepax/igr9kgj/77811805487.pdfIn PDF document text
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/437330.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/dosjiie/top_100_golf_courses_scotland_2020.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/3438924.pdfIn PDF document text
    • https://muxoramosuzuveg.weebly.com/uploads/1/3/4/2/134266249/71132b.pdfIn PDF document text
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/rijezewulofuxemokij.pdfIn PDF document text
    • https://xemuputib.weebly.com/uploads/1/3/4/5/134506680/vazakipi.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/fodose/breastfeeding_unicef_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd8dcfe-41d5-4631-8636-8618888979be/vubowari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0fdc556-80c1-4ce6-b043-e43a667458bc/wazoo_survival_gear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16193f16-37a6-4a18-8f2d-fddeb23a3aa8/96105020500.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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 5636 bytes
SHA-256: 3618e1562a748f6f48dc4f27efaa0558c07f5569a715426584278624206b9a3d
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 10164 bytes
SHA-256: 2eab428ddd94d6ca76525604f74be802d5b105f84e767b9c6caae9005d38205d

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