Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3b522b6fb0249e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-22 11:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7c8f12df3a40da1fa3dd93c5d5c4068 SHA-1: 7fdcc19e382632aef3546089f769d53f531d985c SHA-256: fe3b522b6fb0249edf54abe530777c7d3187b53746b2154edcf52341145af820
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/aws?utm_term=how+much+do+navy+seals+make+in+retirement
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/62bbc4b3025ecad.pdf
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/zuvugeme.pdf
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5ff916703096e.pdf
    • https://cdn.sqhk.co/tinulafi/Mhnifhf/domain_availability_checker_tool.pdf
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fe018cec5afa.pdf
    • https://judaromoperojog.weebly.com/uploads/1/3/2/6/132681758/8646293.pdf
    • https://cdn.sqhk.co/bulunazi/wgeKjjz/vemurisuzopi.pdf
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/bcb703d760ec.pdf
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5ffa22b7dc2c8.pdf
    • http://epaytds.xyz/274068910472j57v.pdf
    • https://cdn.sqhk.co/fajaleniwa/jbhfUUQ/jesuletorevewulusikusirov.pdf
    • http://antileqphh.site/vlo_elliptique_act_commercial_nordictrack_avisk0d1r.pdf
    • http://esclub.info/77459804172h6hn3.pdf
    • https://cdn.sqhk.co/veletafi/fPhbjiE/spacex_crew_dragon_launch_video.pdf
    • http://sakhavto.ru/jisipaluvupewujizisofqn8cq.pdf
    • https://cdn-cms.f-static.net/uploads/4490918/normal_60208b2384a75.pdf
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/volapevo_salilof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_0db930343cd24712adcbaf1d0e5b6c30.pdf?index=true
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_3eb64e5dce7b472dab5a880fdffd78d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b2c18cdb-6f18-45c8-a09f-1757bd2df5c7/stihl_weed_eater_hedge_trimmer_attachment.pdf
    • https://uploads.strikinglycdn.com/files/3b88c651-b6b0-4e13-b41a-6d3e99bfd45d/tipujonugozizuxu.pdf
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_f0ea8c47b8634c98a564060c21d2cd7e.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_a4eb62aae48548a3a41a8a279921951f.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f878.bin
9617f2d89d3970f3945e492b221860ca4984c03ad0b8d644c08c91930c526f21
pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 5340 bytes
font_01_sfnt_off00010a8c.bin
de9f1687a0f93eca19a329e0d06efa4203dc3cab4a676ca4883b1db399b19da6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 10828 bytes
font_02_sfnt_off00012f2f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 4324 bytes