Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8303ba9b3862cbb…

MALICIOUS

PDF

63.3 KB Created: 2020-12-07 08:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05e627193cb54f1e0bc6e626cb6f1d89 SHA-1: 79d43a6eaa9d6df323e6e2503730c58a62ceaf57 SHA-256: c8303ba9b3862cbb4236e074bbfb60739a44b0908d59e2a3165e0ba9d58d4c3d
164 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious phishing document, specifically flagged by ML classifiers and ClamAV. It includes an external URI pointing to a URL associated with betting tips, and a heuristic for a link farm suggests an attempt to generate traffic or distribute content. While no scripts were extracted, the presence of external links and the overall nature of the heuristics point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/aws?utm_term=correct+score+betting+tips+apk+free
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/c4cf8f509.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c7155c7-126d-4387-9169-df3986fc52f8/plasma_cutting_guides_hypertherm.pdf
    • https://uploads.strikinglycdn.com/files/eb8d53a4-a028-43cf-ae73-16d5b75452dc/bead_bracelet_ideas_with_letters.pdf
    • https://static1.squarespace.com/static/5fc375e3ab79f442f239d171/t/5fc6acf13570fb44d1ef3d60/1606855922447/pakistani_chat_rooms_uk_free.pdf
    • https://uploads.strikinglycdn.com/files/60ff34b6-9e31-49f9-9e1e-f2ffbcd4a0ba/medidas_de_caja_de_cd_para_imprimir.pdf
    • https://uploads.strikinglycdn.com/files/8624d202-c69a-491a-8db5-fedb83038b89/65098937084.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53b43f75b16643cbf878/1606374325610/vakujobasolanafasiwa.pdf
    • https://uploads.strikinglycdn.com/files/806b9ea4-035b-4fac-a0b8-f854b058509f/dogixujusazogom.pdf
    • https://uploads.strikinglycdn.com/files/104c0377-0efd-45b8-ab85-3600bcbe442c/wiwol.pdf
    • https://uploads.strikinglycdn.com/files/c7b2396f-2a6d-4dce-a7db-8c3ed20842f4/download_psiphon_4_for_windows_xp.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_off0000bb5c.bin
092e31ed8001ee28b3b95a5a04fb0d4f17950158d330d48d02c07dafe1dff642		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 5260 bytes
font_01_sfnt_off0000cd54.bin
59a06dd1e6c0300d7e2c4439c58b6512ce786bd9496cbd37cb2b65731163851b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD54 10352 bytes

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