Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b46f8d95c96deb0…

MALICIOUS

PDF

84.2 KB Created: 2021-01-23 23:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bbfdc0331b2ebda606cea5b1fc56096d SHA-1: 9aa3a71c8dbaa5bd863900d6b75cdb089ca72bc2 SHA-256: 3b46f8d95c96deb0c7aad615e985df0ba5477c08a06ce65b566febb727430d07
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=subwoofer+12+inch+home+theater PDF link annotation
    • https://site-1174800.mozfiles.com/files/1174800/basket_weave_throw_pillow.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/j9ghLha/stickman_legacy_of_war_3d_hack.pdfIn PDF document text
    • https://site-1237688.mozfiles.com/files/1237688/fusiform_aneurysm_aortic_arch.pdfIn PDF document text
    • https://tadivibudup.weebly.com/uploads/1/3/4/8/134899420/sonaxufebi.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/333d2a9f.pdfIn PDF document text
    • https://cdn.sqhk.co/mipemoku/hbtMwjh/project_timeline_software_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/CVRhfyE/football_coach_2_achievements.pdfIn PDF document text
    • https://site-1230736.mozfiles.com/files/1230736/88732700160.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/2jd5idO/vogogopisolisoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5fe02903427c2.pdfIn PDF document text
    • https://site-1172743.mozfiles.com/files/1172743/27757862479.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/doxulopoxiv_womikosawusujaj_doxijoz_butaxanobalubi.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/eihJZhd/dancing_pixel_ninja_gif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disobaratid.rf.gd/faroese_telecom_annual_report.pdfIn PDF document text
    • http://pogotoxevug.epizy.com/98399092357.pdfIn PDF document text
    • http://piduvazudofem.epizy.com/mezawoluzegedomijibala.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/materias_del_cbc_de_ingenieria_en_informatica.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 5432 bytes
SHA-256: edd163a1d1e5b324ddf536b66c2505c9f139b78a23aa0ccf1131bc4076f726a1
font_01_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10504 bytes
SHA-256: d4279f4501fff4b9b41234016f1a9a18de41c75a59beb830da11a35d923b445c

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