Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c791ef6c126c077…

MALICIOUS

PDF

78.7 KB Created: 2021-04-13 18:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f90f91fd8830aa76f3b03f183bab040 SHA-1: 782b7579d544ecca913824f0b5cba0beebb504f8 SHA-256: 2c791ef6c126c077bb47077eaa8ed406f033c366649c16c911dc01d7a00f4fcc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://dafemum.ru/strik?utm_term=how+to+do+call+forwarding+on+verizon', appears to be a lure for users searching for specific information, potentially leading to phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dafemum.ru/strik?utm_term=how+to+do+call+forwarding+on+verizon
    • http://zawoluduxozebug.iblogger.org/xuzusikox.pdf
    • https://cdn.sqhk.co/vetelojid/jJhjhbu/ben_s_pizza_newsham_blyth.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/latelodiz.pdf
    • https://cdn.sqhk.co/ninivaxibab/8Wgcifg/ludo_king_cheats_ios.pdf
    • http://gikadoketu.iblogger.org/dutesabupalanisopokin.pdf
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/werudon.pdf
    • https://kavejujutafen.weebly.com/uploads/1/3/6/0/136022690/3656b984e.pdf
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/71532cf143.pdf
    • https://suveruwifofe.weebly.com/uploads/1/3/1/3/131380558/wiwofosojejut.pdf
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/17ddf6e223b39e.pdf
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/woputixamin-mujaxipite.pdf
    • https://cdn.sqhk.co/pejinijew/ghZuNhc/20194545475.pdf
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/c3c1ef6b6.pdf
    • https://muxorapud.weebly.com/uploads/1/3/4/4/134455491/viduzobekegeredaliko.pdf
    • https://sajogosekatoja.weebly.com/uploads/1/3/4/6/134682383/8191951.pdf
    • https://pujosudenavi.weebly.com/uploads/1/3/4/5/134508056/7927535.pdf
    • https://cdn.sqhk.co/zipodumup/lhiheiq/boss_full_movie_hd_movies_counter.pdf
    • https://cdn.sqhk.co/senosekagoko/K0gh4ij/63480916433.pdf
    • https://fewabupa.weebly.com/uploads/1/3/4/5/134584226/gagomogovoti_vudama_dedoxokog.pdf
    • http://papopeputato.iblogger.org/blood_and_thunder_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/feff5252-f10b-422a-9c39-949b1def2568/nijonomemukezefubipupem.pdf
    • https://uploads.strikinglycdn.com/files/9acccb6b-f7d5-46cf-b33d-5e3c83d7a3c0/samsung_m2825dw_toner_replacement.pdf
    • https://uploads.strikinglycdn.com/files/8a651c05-7526-4be2-b2cb-06ebc9b769ad/xasaxi.pdf
    • http://vivubela.epizy.com/sandisk_clip_sport_plus_player_bluetooth.pdf
    • https://uploads.strikinglycdn.com/files/adcbb409-cd23-407e-9266-6c7973a92f95/how_can_nmap_be_used_to_troubleshoot.pdf
    • http://xepepofebaxuvib.epizy.com/49370907927.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_off0000f589.bin
442a81b93b6f6fd7dc5312f5c589de14549e475bcc022ea466e764f8ee452858
pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 5176 bytes
font_01_sfnt_off00010754.bin
cff0cafc655db8aa7296bc1a20d82483de8eeee78ba5425fc419515ad6106a33
pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 10968 bytes