Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ca8921a7fbe6a0…

MALICIOUS

PDF

64.2 KB Created: 2021-01-16 22:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bd0a1c1777ba965733bb20f22519e00 SHA-1: 750323c071bb2dad861295f761f847de772bd5be SHA-256: 25ca8921a7fbe6a0e925c24b4cdbdb62a2cb795f295cca79a99ede48b5c09ed3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves a large number of embedded external links, suggesting a link farm or a distribution mechanism for further malicious content. While no scripts were explicitly extracted, the PDF structure and the extensive external links indicate a malicious intent to redirect users to potentially harmful sites.

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://traffine.ru/123?utm_term=haunted+mansion+shirt
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fe9a13fad179.pdf
    • https://wisemidotoveto.weebly.com/uploads/1/3/4/3/134349295/wozomaleputur_rufes_xitavozib_fomovik.pdf
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/rajapowikun-sodajutexamox-xipoximowalod-bawatuxovev.pdf
    • https://cdn.sqhk.co/nuwezomu/bjczop9/best_rock_songs_about_lost_love.pdf
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/1203439.pdf
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f8cfea8c7a3d.pdf
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/gugokozugi.pdf
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f8b55a69db65.pdf
    • https://cdn-cms.f-static.net/uploads/4457005/normal_5fa6215e6673a.pdf
    • https://jitosagar.weebly.com/uploads/1/3/4/3/134318128/8522330.pdf
    • https://fudawaso.weebly.com/uploads/1/3/4/3/134317256/2075018.pdf
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5fca5f04491ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000bde2.bin
13317f781f39c4e17ea56b220c28185c94c9f3c8552daeeede39a1c4ed9dbc6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE2 4996 bytes
font_01_sfnt_off0000ceaa.bin
aee552fe371ed51a8cfff204f41dd013a23a021aaea6b48c34e960500726cc87
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 10756 bytes