Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd1d6a9fdbdaaf1…

MALICIOUS

PDF

70.2 KB Created: 2021-04-06 12:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 829f12d269b98912ee50e85d2a3b7511 SHA-1: 08796e58cefeec2d2ebbee7909a89b183ad99234 SHA-256: ffd1d6a9fdbdaaf106823a53a8ecdf3f5e67850640ea4ba845bbe6c0a5544b94
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate that the primary function is to redirect users to malicious or deceptive websites.

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://seumenha.ru/strik?utm_term=336+marlin+30-30+serial+numbers
    • https://vomuribo.weebly.com/uploads/1/3/1/6/131607062/gigeg.pdf
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601646bca2bf3.pdf
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/458466.pdf
    • https://cdn-cms.f-static.net/uploads/4393637/normal_606351a0b8353.pdf
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/d281cd1b1.pdf
    • https://cdn-cms.f-static.net/uploads/4409997/normal_5fe8161021223.pdf
    • http://lolibixavug.22web.org/nusakujaladizemowuwodoles.pdf
    • https://mulofujuxemo.weebly.com/uploads/1/3/0/8/130874025/dugabewo.pdf
    • https://negopipeminote.weebly.com/uploads/1/3/4/8/134885603/gerazuzodus.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/79b340d1370f841.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/01171f5.pdf
    • https://cdn-cms.f-static.net/uploads/4500897/normal_6046bf91a8cd6.pdf
    • https://sisebafob.weebly.com/uploads/1/3/0/7/130776599/7817715.pdf
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/dibasavumamu-ramixiroz.pdf
    • https://semizafug.weebly.com/uploads/1/3/1/8/131871859/sevivegumafile_gexavozin_niwagijibavuwen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6e8fc19-1bb3-4172-b660-91a918120580/wofigozidezinufididamor.pdf
    • https://uploads.strikinglycdn.com/files/d2dd3f8d-b63e-429d-b2f1-302d09a93eeb/relations_and_functions_worksheet_answers_key.pdf
    • https://uploads.strikinglycdn.com/files/7a8508fc-d1c1-46e9-8a26-aed218b44498/71328183308.pdf
    • http://dikaroko.rf.gd/2484776289.pdf
    • https://uploads.strikinglycdn.com/files/8c1d69fa-6066-46d2-9c86-f493e84bc35b/kejekawufe.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_off0000d548.bin
131c373710e93eb2d7956dfffb6f1a35dc6a6b090f9285ded30ab4af3263de24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 5368 bytes
font_01_sfnt_off0000e76a.bin
6b08e73aa958fe71ba44f071cc5cf0d6c94799a909fd9d9cc153fc3422cf369a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 10576 bytes

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