Malicious PDF — malware analysis report

Static analysis result for SHA-256 b136dbca85ae100b…

MALICIOUS

PDF

67.3 KB Created: 2020-12-25 07:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7690f22ea734aeffffe404c374852541 SHA-1: f998992231369488c4c5e25d9028400ba83eb918 SHA-256: b136dbca85ae100bfe4b74e359e7bc2602ab404563fcbbcd195fe3aca74ea84c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, providing no clear textual lure.

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://trafffi.ru/strik?utm_term=guitar+rock+hero+pro+drums PDF link annotation
    • https://zoforute.weebly.com/uploads/1/3/4/3/134352948/kadepe.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/jdicWji/arduino_nano_v3_0_pinout.pdfIn PDF document text
    • https://xosenevofas.weebly.com/uploads/1/3/5/3/135324499/1662946.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/9f2d99a45.pdfIn PDF document text
    • https://dujekiwirole.weebly.com/uploads/1/3/4/2/134266498/543576.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/sakenonotexalave.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/regoludowu-nabovoru.pdfIn PDF document text
    • https://zixatemanareku.weebly.com/uploads/1/3/4/4/134472678/bb601642a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_5fc10fb57e66d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_5fc0a305d45c5.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/LJSchjm/87793664574.pdfIn PDF document text
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/jamidavafepep.pdfIn PDF document text
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/6a8c0.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/d8aa12fe-2943-4afd-8b25-3f62d9472d43/53462766489.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/smokey_robinson_just_to_see_her.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac792aa5-f798-4b09-90bb-a46a72a73704/nozolezomo.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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 5376 bytes
SHA-256: 14a04e6f107aa16da1a7dcfba1e580e12732cfd33272e94e3374912835cac990
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 10412 bytes
SHA-256: 53ff6eb176a971da70fa8ab0c52d9cddc86a26915f859623e2bb05ec5949bb90

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