Malicious PDF — malware analysis report

Static analysis result for SHA-256 5600a62569618791…

MALICIOUS

PDF

68.5 KB Created: 2020-11-10 01:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61973005eae03d5e933f7e454940e39e SHA-1: 1457aa3b64a3abf846b650f1dae27bbb8fcd50cb SHA-256: 5600a625696187915ede4113123d6fd18aad31e53da04c7b8ce221fb3ed7dfab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URLs identified are traffking.ru and a Weebly hosted PDF, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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?keyword=asl+colors+sign
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/jufavaxozu_noketopapediv.pdf
    • https://busofixi.weebly.com/uploads/1/3/4/5/134576252/vudorijug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b448e560-e6be-4163-901f-37f6d76330f0/vibizivatuwi.pdf
    • https://uploads.strikinglycdn.com/files/85fe77cd-58de-4193-8d29-638cda03e197/bumorajugu.pdf
    • https://uploads.strikinglycdn.com/files/0ee53ce2-65fe-47ee-9e83-2f26fabf35bf/dumefow.pdf
    • https://uploads.strikinglycdn.com/files/14d487a7-c418-41f4-96c4-eda590c79864/burivoposivaruxukelave.pdf
    • https://s3.amazonaws.com/tadovu/nemixejuzekavifebilad.pdf
    • https://s3.amazonaws.com/bofake/walkthrough_for_digimon_world_ds.pdf
    • https://s3.amazonaws.com/wibadinavosunom/90197511169.pdf
    • https://s3.amazonaws.com/lixasifasi/namilusupo.pdf
    • https://uploads.strikinglycdn.com/files/4c059e8d-aa75-4ef3-86f8-a93ffac0fe48/unblocked_bullet_force_poki.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_off0000cf54.bin
8ca476c68aebdd2b21d265e3ac07d2fd6b884879e8af5f7664daa52c491b85af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 4744 bytes
font_01_sfnt_off0000df8e.bin
334c91b9dc3640605563a63e3f118d7e457f04d9a7e4d1c09ec179331f2f4a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 11192 bytes

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