Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f308cde44239df…

MALICIOUS

PDF

89.6 KB Created: 2020-11-22 01:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9ff56a7706a7742fec42cb4082ae6bc SHA-1: 149b301bbb93ad874d3ab79fb2da5e3a40626a33 SHA-256: 74f308cde44239dfbfcc978577dddff0fc0863dac04c6a44ea9f33238912ea73
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'trafficel.ru', suggests a phishing or link-farming scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a malicious campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/aws?utm_term=date+format+oracle+create+table
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f97295bc9cc8.pdf
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/721712.pdf
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5fa1ee817f1b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejobu/rated_keto_cranberry_recipes.pdf
    • https://s3.amazonaws.com/jaburirarov/types_of_metal_alloys.pdf
    • https://uploads.strikinglycdn.com/files/fa1be82f-aae2-47cb-8aa2-0df76d570b02/imaginarium_wooden_train_set.pdf
    • https://s3.amazonaws.com/fadedosi/how_often_to_change_belly_button_ring.pdf
    • https://s3.amazonaws.com/xupimaral/canadian_army_cadet_uniform.pdf
    • https://uploads.strikinglycdn.com/files/cedc0aca-7aa0-440a-88f2-a7f3d87e9cf4/wuweko.pdf
    • https://uploads.strikinglycdn.com/files/bf50d465-53e9-4cc8-82d7-7b2b94a1bb5d/77918423060.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_off000120e7.bin
86bb0a301bf5664a732909ffacd0e5862d24bdba7ceefd21dcbb485ae5599cd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 4988 bytes
font_01_sfnt_off000131d5.bin
3b4a6482c7e44ab51ef61c4dc31c6cf294473b3ba99db9077f5ba9373be3453a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 11156 bytes

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