Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd5aadb51c7365c…

MALICIOUS

PDF

67.2 KB Created: 2020-12-19 00:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3acd85bc6851a3d2960caf639258646f SHA-1: 2b869a546612a7ca9c63972010a2a7ec379e814b SHA-256: 4fd5aadb51c7365c3880608df4f5d495c0954e64e4dfbbf9fde64d98d82ea555
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous external links, with one prominent URL pointing to a suspicious domain ('trafffi.ru') that is likely used for phishing or malware distribution. The PDF structure and the presence of embedded links suggest an attempt to direct users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=critical+fail+chart+5e
    • https://zoforute.weebly.com/uploads/1/3/4/3/134352948/sanal_wulameperax.pdf
    • https://defifipak.weebly.com/uploads/1/3/4/4/134442047/muzitokibagu.pdf
    • https://wafodefa.weebly.com/uploads/1/3/4/4/134480145/3320e17.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25600fde-ec40-4d91-a1f6-e704a91b8c73/zujopumevedelil.pdf
    • https://static1.squarespace.com/static/5fdc7a3b0a190b16b315946c/t/5fdcfd14964bd21b1a57c54b/1608318228691/ruwabokafenujadalapedifa.pdf
    • https://static1.squarespace.com/static/5fdcb84616306c7603b6accb/t/5fdcecd846d05422afe20dff/1608314072775/aftermath_espaol.pdf
    • https://static1.squarespace.com/static/5fc0cbc7c6d964583621a279/t/5fc491dce6d49a06bb2484d9/1606717916634/91553821907.pdf
    • https://uploads.strikinglycdn.com/files/8d0aad56-09a5-46c4-83d6-ecf19ffd69b2/mcdowell_creek_falls_open.pdf
    • https://uploads.strikinglycdn.com/files/44840d84-1b4d-4ec8-961b-8435405eaba9/74846384280.pdf
    • https://uploads.strikinglycdn.com/files/62d2b7b5-e2aa-4166-88b5-e253366aaf35/30714162124.pdf
    • https://uploads.strikinglycdn.com/files/c4994257-1cde-40cb-a003-1dfaec393736/55942667194.pdf
    • https://uploads.strikinglycdn.com/files/5623448d-b588-47f3-a063-8e9cba71a149/96675612991.pdf
    • https://uploads.strikinglycdn.com/files/4e268cbf-34c3-4056-9131-c110e762d76d/wobobazakaxidasadofolafon.pdf
    • https://static1.squarespace.com/static/5fc1480d27a199023ab7f389/t/5fc4ba0d3f75b16643697807/1606728206608/section_10.1_the_mole_a_measurement_of_matter_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce72.bin
f9b93609d33534911bf2cb119ce8281abc77a68907ff30dabe21f2024167c472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 4820 bytes
font_01_sfnt_off0000ded0.bin
e27fd3c2bee2ac60d08a9d6b67f445d60db18bc697cc33ed089d2404d35ba746		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 9736 bytes

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