Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3368f4131cd473…

MALICIOUS

PDF

74.1 KB Created: 2021-04-17 21:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0731d513ba3641414080745a6c09456 SHA-1: 98c06487180ac35f4fd56ed87d7d4f83be7ac3e6 SHA-256: cb3368f4131cd47300b63c73894100378f0eeaf2a8017508485e88d90cc12f1f
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that lead to potentially malicious domains, disguised as helpful content. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to further malicious sites. No scripts were extracted, but the presence of multiple external URIs points to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=how+do+you+answer+tell+me+about+yourself+in+an+interview+with+no+experience
    • http://retapadu.medianewsonline.com/peraxijivomixewifaz.pdf
    • https://sefidobove.weebly.com/uploads/1/3/4/3/134320077/4166810.pdf
    • http://feludekinopotas.scienceontheweb.net/the_seven_wonders_of_the_world.pdf
    • http://ingmijn.com/weekly_ads_and_salesyak6m.pdf
    • http://mosasekoz.22web.org/activity_icons_free.pdf
    • http://bossyonlinex.com/pov_car_driving_apk_hilea71m8.pdf
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/puxonujazilob.pdf
    • http://fumufede.iblogger.org/55545784744.pdf
    • http://orbitan.fun/6228563964jer9o.pdf
    • http://blablablacar.online/pamobepugojwpu9c.pdf
    • http://vodabutopidaru.getenjoyment.net/aerial_yoga_poses.pdf
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/d383f1cb5b40897.pdf
    • http://optamorem.com/bounce_ball_game_freem0fki.pdf
    • http://profer-opt.ru/38947545039vajt8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jategemi.epizy.com/alexandra_david_neel_magic_and_mystery_in_tibet.pdf
    • http://wuwepapose.epizy.com/ximoboge.pdf
    • http://vutuzepen.epizy.com/16428674607.pdf
    • http://rizizevifixelu.epizy.com/kesonifofol.pdf
    • http://vorisenunajix.myartsonline.com/64249691846.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_off0000e270.bin
5706282e416243f48ef6a847e004c419fb83c60ffc1191b6f6c3317e1e4c7028
pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 5816 bytes
font_01_sfnt_off0000f630.bin
fefe0fc8eded72fe7258c75d337c7929fb276279ce5753f48fc32a062f860641
pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 10988 bytes