Malicious PDF — malware analysis report

Static analysis result for SHA-256 356372fedd19be38…

MALICIOUS

PDF

68.8 KB Created: 2020-11-26 04:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 496bfd2b9c0cf1237917b7c530ed25b0 SHA-1: 5869e08ff2c40d466136aa2983629344adc5069d SHA-256: 356372fedd19be38147659cd3e93b04b962f8c376b42a7b8fbf755995742310e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to 'traffking.ru', suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate it's designed to redirect users to potentially harmful sites.

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://traffking.ru/123?utm_term=outdoor+deep+fryer+home+depot
    • https://nogegonimever.weebly.com/uploads/1/3/4/3/134340032/a0676014add.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/5485696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc07955b-d4e8-4d01-98a3-e353fbe41c4b/66125909119.pdf
    • https://uploads.strikinglycdn.com/files/15950800-12a5-4d08-b3bb-4fc11b8c86c2/14557972482.pdf
    • https://uploads.strikinglycdn.com/files/84ad0c5e-b3e4-401f-bc6a-ebf5206870ab/princess_vitarah_nude.pdf
    • https://uploads.strikinglycdn.com/files/b8a51280-1bfe-46b1-947d-297a6eec495a/94462933683.pdf
    • https://s3.amazonaws.com/xarojapi/accident_and_emergency_reporting_procedures.pdf
    • https://s3.amazonaws.com/xozeb/kenowiwikimekenurix.pdf
    • https://uploads.strikinglycdn.com/files/3b84b35b-9853-4c64-804e-6995c649c183/40867992075.pdf
    • https://s3.amazonaws.com/subud/megabox_apk_2019.pdf
    • https://uploads.strikinglycdn.com/files/5aad6a57-268a-4cfe-8f04-65153d28e4f4/masterbuilt_turkey_fryer_and_seafood.pdf
    • https://uploads.strikinglycdn.com/files/64e2821c-4c99-4761-afeb-81ffc6ca96e3/20_in_2020_by_gretchen_rubin.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_off0000cf5e.bin
dc6a1b329f54fc006313e53b5106492f203f79122a25f8ae6d15f19c60d3f259
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 4988 bytes
font_01_sfnt_off0000e031.bin
45dbadfbee865c7a426ea769a7a910aea23efdf914b96145ea3907aa442b9db6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 11504 bytes