Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49c41d150740840…

MALICIOUS

PDF

79.3 KB Created: 2021-04-02 16:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf3a43668f0d12a62ebafe527292402d SHA-1: 3a02bacc2f963b840243554cdbd2946cd949b2cd SHA-256: a49c41d150740840fbc68a3acc28b7c43827c1c9e6a82ed3a918ea30c0b9a71d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these URLs, https://botokaw.ru/aws?utm_term=tiger+rice+cooker+5+cup+inner+pot+replacement, is directly embedded and likely serves as a lure. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of this document. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/aws?utm_term=tiger+rice+cooker+5+cup+inner+pot+replacement
    • https://cdn-cms.f-static.net/uploads/4444104/normal_60433a8f4e3ac.pdf
    • https://cdn-cms.f-static.net/uploads/4391642/normal_6047a38c67e75.pdf
    • http://nout-sale.site/zesabibupovogamediji5ieg3.pdf
    • https://cdn.sqhk.co/zimuteraf/ujdjbXC/one_gold_bar_cost.pdf
    • https://cdn.sqhk.co/konanetufuda/i38hhCB/marketplace_insurance_phone_number_ny.pdf
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5fd851d3a7330.pdf
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5fece97374526.pdf
    • http://mivetys.xyz/dererixinefeditowimotogfpuw.pdf
    • https://cdn-cms.f-static.net/uploads/4482880/normal_60264fd679e76.pdf
    • https://cdn.sqhk.co/tijinujul/rlxPCia/vibizitiguxe.pdf
    • http://bigmagazin.xyz/vocabulary_for_toeic_test7diuo.pdf
    • https://cdn.sqhk.co/ganidabizi/jdEmhgO/mudopaxizejenoladunuk.pdf
    • http://vopugixeroramox.medianewsonline.com/wejibezurupasiwabexitupe.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/1e3af6c1f.pdf
    • http://all-host.site/52607535564k6gjg.pdf
    • https://cdn.sqhk.co/telazaje/jhfiejh/23402474543.pdf
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/3512395.pdf
    • https://cdn.sqhk.co/gowamojon/gj1jdjj/14621458471.pdf
    • https://jafiwivejo.weebly.com/uploads/1/3/5/3/135305612/xomoxik_welaluwu_bimifijurasalil.pdf
    • https://cdn.sqhk.co/soxosovave/9hgzjgV/35882679135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zuxokoberibaw.atwebpages.com/fogadabuzewutatefesigizof.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_off0000f8d3.bin
a37b3554f6383596477d8b4208d2945eef012e2456f9f4b38a17e4c233847ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 5212 bytes
font_01_sfnt_off00010a89.bin
0d05d6345e46bb0ecf4abb49cac91d74ce3cb6d7875febfd4cb9be626ca06b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 10888 bytes

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