Malicious PDF — malware analysis report

Static analysis result for SHA-256 512ca0fc8dfa6f0f…

MALICIOUS

PDF

69.3 KB Created: 2020-11-12 22:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d839a86c8c6a720be38a903d703c746a SHA-1: d6f7db5969d7c080e1c9f8b71fe0b0e23b641a71 SHA-256: 512ca0fc8dfa6f0feff05db73c429ba81eff26a1698a7a164ee8e86a2df28842
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely for SEO manipulation or to distribute further malicious content. The embedded URLs point to suspicious domains, reinforcing the phishing or malware distribution vector.

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://trafffe.ru/aws?utm_term=internal+expression+of+interest+letter+template
    • https://cdn-cms.f-static.net/uploads/4421210/normal_5fa0d484baffc.pdf
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f875db41cf2a.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdf
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/a0935ea5e7b878.pdf
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/jupuzimoduved.pdf
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/jovubaguka-bevonilepesavu-bikas-gupedo.pdf
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdf
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/1762990.pdf
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/8141410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ruzumeb/statistical_hypothesis_test.pdf
    • https://s3.amazonaws.com/susonanezaj/76018240942.pdf
    • https://s3.amazonaws.com/xanebavifamopez/lajonozezozawadek.pdf
    • https://s3.amazonaws.com/nufidibodudulad/cisco_linksys_e3200_manual.pdf
    • https://s3.amazonaws.com/kesumasaka/jifuwurejos.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/97123703070.pdf
    • https://s3.amazonaws.com/zasepo/guide_to_physical_therapy_practice_pattern.pdf
    • https://s3.amazonaws.com/zupenafud/to_kill_a_mockingbird_review_crossword_puzzle_answer_key.pdf
    • https://s3.amazonaws.com/kewakuko/jujafotep.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_off0000d1c5.bin
ea32173cd90510ae45e4f6c122a0db09bff0edb834b8369c446aeb2407241074		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 5052 bytes
font_01_sfnt_off0000e2e5.bin
99c17fad1f9487bdeb8df2a0c0164d7c5d544ccbfa75119b92a567b225feb957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 10960 bytes

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