Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f1f5d2d1014a3…

MALICIOUS

PDF

70.1 KB Created: 2020-11-19 04:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2f67227f3e70aaa9c0f54368ebec9f78 SHA-1: e1c43e4ce0443018e8e4ab083abba3da0969db3f SHA-256: 6a3f1f5d2d1014a353305760ac49343b412ae7bdf11f398425793e280890ce8b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to user-generated content platforms, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is trafffe.ru, which likely serves as a redirector or landing page for a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=asphyxia+forensic+medicine+pdf PDF link annotation
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/24785.pdfIn PDF document text
    • https://kinumonitebira.weebly.com/uploads/1/3/4/6/134605003/basal.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/3263271.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/07c0ba3a-a94b-4a77-8708-1677b8a365ff/dragon_disciple_builds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2b2afb-1a69-4433-8a92-28e2950d2e2c/kadaguga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f40acdf-f447-4615-8c79-f52e12ba93c2/bevakidazinezur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1d8434-a736-4039-a669-242f48d52762/xejobute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bb1d11-5774-4201-848f-f629438a2246/10238140809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b2259e-5d96-44e2-b916-03d50a2c3e98/linear_systems_and_signals_lathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb309fc2-808c-473b-9634-f1985016d87e/kopodanubusisolebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9f5a5d-eab8-4c91-b63a-5baedbe6ee9a/download_professional_weather_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/293506ea-0501-49b4-8091-521b49f02d2f/neguja.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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 5520 bytes
SHA-256: 6660b5374bb3b8beb40d9127b463b3fed36fbd09c44dae2dee883c6335c96a2f
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 10436 bytes
SHA-256: 61feef697e30b998c833864d83e2214731a593514320ac40eefe6b5e5b870059

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