Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72f22164b4701d4…

MALICIOUS

PDF

70.1 KB Created: 2020-12-23 16:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31172763a3be86105f8a8ad1df22f2f SHA-1: 67b4758c7f224588f0870b92be78e07411b5100e SHA-256: a72f22164b4701d4ae485e92e62a2d6384fb640e5745b3478da036e1b8386886
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier also indicate malicious intent, specifically flagging it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the structure and numerous external URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=advertising+marketing+and+pr+internships
    • https://cdn.sqhk.co/jibenapola/CgeObjm/glowroad_review_tamil.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/pidimonurevinizu.pdf
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/5787279.pdf
    • https://cdn.sqhk.co/jibenapola/CobgifI/draw_me_like_a_french_girl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/dd30ee4d-c63f-428b-b4cc-24954061ffca/space_engineers_control_block.pdf
    • https://uploads.strikinglycdn.com/files/8e9fc9c4-d770-4cae-96dc-fba8d3ec7170/45400312613.pdf
    • https://uploads.strikinglycdn.com/files/dca99958-0eda-4afd-aa92-c135dfeeeda6/pi_day_scavenger_hunt_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/f1547a80-87c6-4ae6-9ef0-19b8fd8b8f15/community_helpers_cartoon_images.pdf
    • https://uploads.strikinglycdn.com/files/f025e225-c60f-4380-9c7f-bf0fecdab521/34494312353.pdf
    • https://uploads.strikinglycdn.com/files/20da3fb8-7a0b-42e5-872a-975a56213c52/edipo_rey_gredos.pdf
    • https://uploads.strikinglycdn.com/files/1ac10639-d940-4a35-9a73-0c2cfbcf39df/sodusavoriganamuwatoxafo.pdf
    • https://uploads.strikinglycdn.com/files/77d009b1-145d-41f5-9e09-f44286309b16/science_graph_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/7cb5db3e-c8df-40ad-8560-8772892fd080/koopas_revenge_2_all_secret_exits.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1f.bin
95f9a62db371459f1f782e23aaeee98c41509a307001be665ce398ea66aaf8f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 5132 bytes
font_01_sfnt_off0000df5e.bin
206ae49a5a3f7e6c1801cf87146a4ddd0618bee0643a06840801e371cb9cc927		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 8876 bytes
font_02_sfnt_off0000fd35.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 4324 bytes

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