Malicious PDF — malware analysis report

Static analysis result for SHA-256 44639e6a112fc2a2…

MALICIOUS

PDF

91.7 KB Created: 2021-03-08 20:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8e422c794669660f87644b0ad586551 SHA-1: 2843cea1c39e2dde93b85d16daaec325f83a7de3 SHA-256: 44639e6a112fc2a25168331ae33ee29a253f684c6b18686c1b2455ea167fbab3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://lozipotod.ru/aws?utm_term=is+your+learning+curve+a+horizontal+line
    • http://nokasosozigof.mypressonline.com/58720965096.pdf
    • http://smotrikino.fun/what_is_classification_in_data_mining_explain_with_example3n5fg.pdf
    • http://feludekinopotas.scienceontheweb.net/84661212078.pdf
    • http://lojupubevodi.22web.org/80192119010.pdf
    • http://lixakux.22web.org/libro_de_historia_5_grado_2019_pagina_14_y_15.pdf
    • http://laulu-go.ru/new_tom_clancy_xbox_gamesnz1ij.pdf
    • http://nukels.xyz/el_conde_de_montecristo_pelicula_1975_onliney0cov.pdf
    • http://raicen.com/medeximawekiraditafaxe08064.pdf
    • http://bukenisefino.mygamesonline.org/wakorowinifadiw.pdf
    • http://getsol.xyz/xadapofabekovunotolimofmd6ga.pdf
    • http://teplotronic.ru/2918164979192cbm.pdf
    • http://teachost.com/95953926433471p7.pdf
    • http://begdas.space/nuevo_diccionario_biblico_ilustrado_editorial_clierafyh.pdf
    • http://hs-life.ru/stealth_cam_trail_camera_sd_card_formatiyzy1.pdf
    • http://lorakuze.sportsontheweb.net/87259050638.pdf
    • http://galajanexagaj.iblogger.org/how_to_draw_a_isosceles_triangle_with_a_compass.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kugukokoner.myartsonline.com/bohemian_rhapsody_music_sheet_piano.pdf
    • http://vovuvap.rf.gd/waposakubugerozopuwoga.pdf
    • http://rufujomuxa.epizy.com/wiritojiwisejuwozajiv.pdf
    • http://pazasirar.epizy.com/5772986907.pdf
    • http://vovojoj.atwebpages.com/200_gramos_de_harina_a_ml.pdf
    • http://pelubameta.epizy.com/71334719050.pdf
    • http://fetekovabu.onlinewebshop.net/orbit_irrigation_lcd_2-port_digital_hose_digital_hose_faucet_timer_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c9a.bin
6e34639f26ec2a56dd0833418e69fbd6cec5ab8cebe38299bf71851dc9199276
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 5092 bytes
font_01_sfnt_off00012ded.bin
a750352c0fcc645ee50f5ea653f210b6ce41cca488b4d4431e800cdbc572a674
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 11008 bytes
font_02_sfnt_off000152f1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x152F1 4324 bytes