Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f95d713db739d9…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 21:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82688f0a043adf0ed72632d6bc142aa0 SHA-1: b964f4cbb742ec4a84349a34abe944f52f9461fd SHA-256: 04f95d713db739d985e89982cb94a77978b532958b41db9a1dec1708e22d7a93
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate documents. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs, such as https://seumenha.ru/wix?keyword=billboard+bluetooth+speaker+bb742+manual, are likely used to redirect users to malicious content or download further stages of the attack.

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://seumenha.ru/wix?keyword=billboard+bluetooth+speaker+bb742+manual
    • https://cdn.sqhk.co/letinumi/jbAjcie/us_sniper_assassin_shoot_mod_apk.pdf
    • https://cdn.sqhk.co/letareximo/guXieRn/space_invaders_arcade_machine_repair.pdf
    • https://cdn.sqhk.co/safubuguva/Sugcbvw/wood_craft_sticks_near_me.pdf
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/9325819.pdf
    • https://cdn.sqhk.co/lilakeboj/gejjygf/59259339743.pdf
    • https://cdn.sqhk.co/talurelope/QGgeCGt/53915037507.pdf
    • https://cdn.sqhk.co/lorotukogof/RjfVhb7/gekilapexakewak.pdf
    • https://cdn.sqhk.co/girolivudafo/Zhfggih/santorini_restaurant_chicago_closing.pdf
    • https://cdn.sqhk.co/vekasurox/ge3iagj/cheap_island_for_sale_canada.pdf
    • https://cdn.sqhk.co/josedinis/vd9ijFl/air_controller_pay.pdf
    • https://cdn.sqhk.co/xeloxilava/iigbgiy/void_tyrant_cards.pdf
    • http://idealica-co.site/what_car_seat_with_uppababy_vista782fj.pdf
    • https://cdn.sqhk.co/vujaderaz/haijPjg/minetop.pdf
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/73565.pdf
    • http://alternativeinfluencenetwork.net/fopibemorofefgh7jx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixamupelinere/mebegebaporilipeb.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/55669999289.pdf
    • https://s3.amazonaws.com/senodiw/danusibowobuxidubobopas.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_off0000f51f.bin
cda2f932eb074027bbc38e07b9b8569c6b920210b6c6a4f84085174ff64171dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 5752 bytes
font_01_sfnt_off00010891.bin
fdf25b28b8c0b740aa0d0f3f1eafeb0e8da201173e2a091545852960dc301588
pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10940 bytes