Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc7e1f3357a7a0b…

MALICIOUS

PDF

70.8 KB Created: 2020-12-31 20:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa2bfd4ff72ec3da28f4f80790810ad SHA-1: 78d48799e8481c625c3c70eb693253fcec82ab5b SHA-256: 7cc7e1f3357a7a0bfa366361d23ebf816d57ef977d92b1a632039cf70092c457
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are part of a link farm designed to improve SEO, and one specific URL points to a potential malware download. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a phishing attempt related to lotteries or prize deliveries. The ML classifier and ClamAV detection further support the malicious nature of this document.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://trafftec.ru/strik?utm_term=gigalife+apk+uptodown
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/378199839021505.pdf
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/232dd1.pdf
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd1e2b3ac6fc.pdf
    • https://cdn-cms.f-static.net/uploads/4458840/normal_5fd5fe90f0bbf.pdf
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f8a43e0b7451.pdf
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/5321411.pdf
    • https://rasagarus.weebly.com/uploads/1/3/4/4/134452949/jitaxofodavafizawo.pdf
    • https://cdn.sqhk.co/vuxevabuvix/gsjeIjg/wolf_wallpaper_4k_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4f3fd62b-8772-4e9a-b13b-6e7c52d88631/gotolipaxag.pdf
    • https://uploads.strikinglycdn.com/files/d061940f-d5c4-4c0a-8d10-c7a85c28ec72/57867244628.pdf
    • https://uploads.strikinglycdn.com/files/9c047dbc-fdce-4c1c-bee7-cf72cdcd597b/76832328858.pdf
    • https://uploads.strikinglycdn.com/files/3addb676-408f-4996-8ee8-fbbf785e6929/78397031708.pdf
    • https://s3.amazonaws.com/wixamupelinere/75229784227.pdf
    • https://uploads.strikinglycdn.com/files/2f623583-8c3f-4493-82f0-64556e9fe710/71027651651.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_off0000d878.bin
16343ffbfa00392cb658ce9a194d397c1d93efc646912cfaab3e021ebd92c798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 5124 bytes
font_01_sfnt_off0000ea19.bin
f27f61135c57a101c55dbc082a03e21b2b37b13d979d4884fd1f035aa907dd0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10748 bytes

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