Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01b4b259a3aee8d…

MALICIOUS

PDF

66.7 KB Created: 2021-06-01 12:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 995185628905c21b4fd72c93168f528b SHA-1: 2925d2d4f0b2911e7f0497e14156f59a37e11ef3 SHA-256: e01b4b259a3aee8d2d580a54b39c0f3a1a3478417cf17e0c75d6181c7109fbcd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results for specific documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

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://nomylo.ru/pbw?utm_term=2013+yamaha+fjr1300+owner%2527s+manual+pdf
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5ff614546ede5.pdf
    • https://static.s123-cdn-static-d.com/uploads/4372702/normal_60b192c9b4752.pdf
    • https://cdn-cms.f-static.net/uploads/4459777/normal_605bfe6a4f95c.pdf
    • https://giledaxije.weebly.com/uploads/1/3/4/3/134312043/8560080.pdf
    • https://static.s123-cdn-static.com/uploads/4493579/normal_6003cd6b67b0c.pdf
    • https://cdn-cms.f-static.net/uploads/4471488/normal_602b8f1783074.pdf
    • https://cdn-cms.f-static.net/uploads/4449399/normal_605a9c1dee0bc.pdf
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5ff8fa8b2f2dc.pdf
    • https://static.s123-cdn-static.com/uploads/4426686/normal_5fca874a61d75.pdf
    • https://cdn-cms.f-static.net/uploads/4472764/normal_605bea955607e.pdf
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fd172e60a789.pdf
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/737b6.pdf
    • https://cdn-cms.f-static.net/uploads/4426416/normal_60238bac0ccfc.pdf
    • https://cdn-cms.f-static.net/uploads/4421943/normal_605be512f3bc0.pdf
    • https://cdn-cms.f-static.net/uploads/4368751/normal_602348dc4179b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ziludezubeju.pbworks.com/w/file/fetch/144451608/walgreens_boots_alliance_employees_at_home.pdf
    • http://mapijakemifo.pbworks.com/f/actividades_para_trabajar_homofonos_y_homografos.pdf
    • http://vugufosenene.pbworks.com/f/how_to_hack_brothers_in_arms_3_android_without_root.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_off0000c6f4.bin
ead82336db15b9b94b48c70441022b4311848bb9ed9a2d44815df421a10d2a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 5980 bytes
font_01_sfnt_off0000db4b.bin
4132b1566a042a9a9a1ff930f764a6710313ec37d0cf55556095fcebf5c05be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 10084 bytes

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