Malicious PDF — malware analysis report

Static analysis result for SHA-256 454cab47aa98b2cf…

MALICIOUS

PDF

85.8 KB Created: 2021-04-23 23:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc07812bac6c4d694cf24cda0ad66c09 SHA-1: 871a8f1ef91bd711e90c14a538f82cb5a1e5a812 SHA-256: 454cab47aa98b2cfc61f2a9db167a9a466fd054703c9f9aee6bea6acc7ff9ba5
196 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The presence of a 'Password-protected archive handoff' heuristic indicates that the document likely instructs the user to decrypt an archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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+to+pronounce+korean+alphabet+correctly
    • https://cdn.sqhk.co/reruzemafow/7jggjij/drive_in_cinema_near_me_christmas.pdf
    • https://cdn.sqhk.co/novitovikor/jeBxGhe/dexurujufavam.pdf
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/87edb7038e8749.pdf
    • https://cdn.sqhk.co/mowuseparap/hhgmgiD/41722573597.pdf
    • https://cdn.sqhk.co/xovikojux/jifoyCd/lerilatafevere.pdf
    • https://tafopolen.weebly.com/uploads/1/3/4/3/134396822/jiboxa_nurijusuforuno_novetuliwotora_getidinusudanor.pdf
    • https://cdn.sqhk.co/duzemata/ROQhXf6/o2_international_sim_top_up.pdf
    • https://cdn.sqhk.co/zolewiko/gf7hcgd/globe_at_home_default_password_hack.pdf
    • https://cdn.sqhk.co/redexisa/ibXhg6H/formula_drift_ferrari_forza_horizon_4.pdf
    • https://cdn.sqhk.co/jupumezu/jcggyoM/plantuml_class_diagram_template.pdf
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/dejebizinat.pdf
    • https://cdn.sqhk.co/giwitosak/hjjc9gi/nevufinebupu.pdf
    • https://robiwadanojiso.weebly.com/uploads/1/3/4/6/134644007/zivux_kikorogesinafad_tizavaval_puwufafapu.pdf
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/mivosezupebuv-vabopedusod-maxudim-jadubixap.pdf
    • https://cdn.sqhk.co/xolofiwano/gjieigD/98502699389.pdf
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/3398440.pdf
    • http://manybigs.space/ruvixufubuzefexbc07.pdf
    • http://nibelv.xyz/billeting_officer_uniformz3rtk.pdf
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/9847593.pdf
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdf
    • https://joruluzadazalit.weebly.com/uploads/1/3/4/6/134673717/lukezevotam-susagaz-turixukejikovi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f322.bin
9bf9826ee0e40f8e309811fc081af14b9720832bc154ffc44bd65038bac00af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 8632 bytes
font_01_sfnt_off0001109e.bin
a4478d19378a8b642d3684407e68fdd3e7a4f6104eb0d3c84c7f8bca5027a37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 5204 bytes
font_02_sfnt_off0001225e.bin
929f4d7d74ac4464c31726332dcf4599591f3a2c6e685dee46291a8feb3b137c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 11908 bytes

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