Malicious PDF — malware analysis report

Static analysis result for SHA-256 6686cfdbcd96c6d2…

MALICIOUS

PDF

90.5 KB Created: 2021-03-25 01:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23ac6ffb0e2e6039a0442078b6a95aa4 SHA-1: db1a55fbfcae4ba9ef4890a75ae1c91971e4e35f SHA-256: 6686cfdbcd96c6d228a4fc667e4272d3ec24cae5e4a67d057d0278531b0246c8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicative of a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or phishing content through these links. The file's structure and numerous external URIs align with techniques used to obscure malicious payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/wix?keyword=arthur+miller+all+my+sons+pdf
    • https://cdn.sqhk.co/delinilipo/hbjhxgj/71199642471.pdf
    • https://zutafemaz.weebly.com/uploads/1/3/4/4/134478566/5e17bfc4ab.pdf
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/1241788.pdf
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/b941bfb.pdf
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/5257671.pdf
    • https://cdn.sqhk.co/mugejufunij/hDghjcC/sukite.pdf
    • https://cdn-cms.f-static.net/uploads/4449397/normal_604acba8e7040.pdf
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/5925240.pdf
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/568764.pdf
    • https://cdn-cms.f-static.net/uploads/4453754/normal_604365442f738.pdf
    • https://mokasinerosun.weebly.com/uploads/1/3/2/6/132682676/b75c7.pdf
    • https://cdn.sqhk.co/bebetirifam/hejaich/lebara_top_up_germany.pdf
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60150d6b7fbf4.pdf
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/ac6b095a7136.pdf
    • https://xuviwutub.weebly.com/uploads/1/3/4/6/134697068/wibofit.pdf
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fe807d6b524e.pdf
    • https://nixodogal.weebly.com/uploads/1/3/0/7/130739919/2475678.pdf
    • https://cdn.sqhk.co/wugolekufo/4MtgdPv/zombie_clash_java_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a7d7cd0c-8b65-4ed2-a0e7-1096cdbe5bf3/461_stihl_price.pdf
    • https://uploads.strikinglycdn.com/files/37b4269c-0c88-4393-9cfb-41e51ae6bae7/how_to_increase_mind_power_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/8b343b8e-3d85-4392-a2bc-16e8ad0396cc/41450626987.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_off00012490.bin
afa8d0f11d9f8de345304bb0ad65039e395f602b0c1f8131e0295d1fdec608ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 5372 bytes
font_01_sfnt_off000136b0.bin
c83d81e27d42e94c1a7bccd82d0c86d93ced67bc48ce871e1c111f1a8a402761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 11496 bytes

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