Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c39cf6753f94da…

MALICIOUS

PDF

72.1 KB Created: 2021-02-18 20:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3f532eadec625243617648eced7b5dc3 SHA-1: 893a995637fc4f5843300d92c104e861f862a8ca SHA-256: c4c39cf6753f94da6f005e47b8512b7aecc98cab95ef3aa8cad30e6f5e3083f6
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/123?utm_term=how+to+connect+thrustmaster+hotas+to+xbox+one PDF link annotation
    • http://heartcenteredequestrian.com/skill_combinations_divinity_2ro1k6.pdfIn PDF document text
    • http://quickstore.pro/74862180206q2sa7.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/3649264.pdfIn PDF document text
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/rukodugigojepuvevi.pdfIn PDF document text
    • https://woxumonukoke.weebly.com/uploads/1/3/6/0/136090180/gikufujirusepe.pdfIn PDF document text
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/bulotazidusa.pdfIn PDF document text
    • https://cdn.sqhk.co/lojiwoxaz/ibjf5jf/6882715657.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/zesasevik.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/metakibeme/17828916280.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/ielts_reading_test_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/beautiful_all_flowers_images_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 5268 bytes
SHA-256: 22506540f073e6279717d6b4c68e4974b75bc1c33fb7fea47acb0ce8b9e28308
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 12000 bytes
SHA-256: 92c58980a551f2da791b7244f44d8e8e33c00b8b90df991af8ac616dc4520c5a

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