Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da8611d2711f89d…

MALICIOUS

PDF

79.8 KB Created: 2021-04-26 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1921af06c7d4a581f30145d79ad612b3 SHA-1: ceafcf50c9fba0c6bc538b1d3a3ae8aafb471110 SHA-256: 0da8611d2711f89de39b224767f33528c37a3ee4bc9a7451b839ae5630f1e08b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and Weebly subdomains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=books+like+becoming+his PDF link annotation
    • http://upsbox.ru/flaine_snow_report_december1p4n3.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/ZkjdggM/totally_accurate_battle_simulator_download_apk.pdfIn PDF document text
    • https://nulabelavomeviz.weebly.com/uploads/1/3/1/4/131413951/widegop.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/ibBChiA/super_soccer_champs_2019_apk_full.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/aiaPTgd/trick_art_dungeon_game_apk.pdfIn PDF document text
    • http://6gusevshop.space/12659145570nnxtv.pdfIn PDF document text
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/xopux-xefivinejid.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/6712282.pdfIn PDF document text
    • http://torchland.xyz/41998847718h9xu0.pdfIn PDF document text
    • http://steelsho1.club/91540234775nw2kl.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/jovaj.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/2713071.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/ec0f8f7.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/sidukutofarobi_rurafaduvim_wejef_sesavisulijegam.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/vijejirija.pdfIn PDF document text
    • http://gtomishebs.xyz/60896105400l23yr.pdfIn PDF document text
    • http://salonop.xyz/cules_son_los_sntomas_de_un_celiaco_adulto8ongl.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/sekeliniza.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/tugotebejozu.pdfIn PDF document text
    • http://kkkirrreeee.space/contabilidad_y_costos_definicion_segun_autoreszuc6h.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/lolonugole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 5160 bytes
SHA-256: e5661207ba7ea3cd243b83c2759688fd6d0e797a4861ae2de1877cc0ece42010
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 11220 bytes
SHA-256: a2bd9ca937d6098b1d4b08593a49be3c3d4ba1a673e02dd72d2bc5d294704b65