Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4197021bd4fbe3…

MALICIOUS

PDF

68.4 KB Created: 2020-11-24 06:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33b5d2a042062e3e9e1bf62ef8bb7cdf SHA-1: df19ee8abfed6f742bb6e35197d43fcb70d32f36 SHA-256: 5c4197021bd4fbe334a79b8ab4aa188428642c510f6b45b50012ae3dc9352217
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://traffine.ru/strik?utm_term=convert+dbm+to+milliwatts', is likely part of the malicious infrastructure. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=convert+dbm+to+milliwatts
    • https://sizasaligibi.weebly.com/uploads/1/3/4/5/134506534/xufev.pdf
    • https://xemakoxen.weebly.com/uploads/1/3/4/3/134320116/zafolulo-zoteg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4536343d-e8e1-4b0c-bfbb-e3bf02ac42ef/morimajomorop.pdf
    • https://uploads.strikinglycdn.com/files/a18ba6d1-6ca5-42ff-bf4c-82342483f35f/how_to_get_games_on_ti_84_plus_c.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/9197360965.pdf
    • https://uploads.strikinglycdn.com/files/ce410fcf-b4f1-4e6d-90a2-0839941ad52c/sizuniduwutos.pdf
    • https://uploads.strikinglycdn.com/files/98c911ad-d316-4264-92af-83d3d397407c/7843603147.pdf
    • https://uploads.strikinglycdn.com/files/5fecaca7-1046-446a-995c-4526bf283698/wudorefeveg.pdf
    • https://uploads.strikinglycdn.com/files/c3bbc5b2-b0c1-48bc-b888-0ab3ed3862d0/metodiva.pdf
    • https://uploads.strikinglycdn.com/files/0070951a-43f9-4917-8449-f0d93da2ac7f/burgle_bros_apk.pdf
    • https://uploads.strikinglycdn.com/files/b6c65edf-1433-4cfc-8dbc-7ec70aeb932f/practice_12_2_chords_and_arcs_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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b902.bin
2e251a9f3dfa845fbb40e8fe89cb3dece436d82c6fc1a2c0623d8522b5bc260f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 5168 bytes
font_01_sfnt_off0000ca87.bin
077176b901f866addf453f9fa67e2bccee63d903efa2de18f6a79f00d50f412b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 11728 bytes
font_02_sfnt_off0000f030.bin
b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16060 bytes

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