Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c7773aac60b0c8…

MALICIOUS

PDF

72.6 KB Created: 2021-03-04 12:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: b9bb85f8f0c1bcbdaf86499292c74ee3 SHA-1: 4418a971cfa9b1540018c396ab5dbb95290849b6 SHA-256: b4c7773aac60b0c8a73df77e182bda616a8665f2d45bb7330c61c65a146c0873
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://kuzutuzo.ru/wix?keyword=concave+mirrors+extra+practice+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/bamazaludez/gmpIThb/43155099956.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/ijUO9Rk/rider_neon_bike.pdfIn PDF document text
    • http://cmb-accueil.com/jiffy_lube_synthetic_oil_change_cost_canadabetwb.pdfIn PDF document text
    • http://sandiego-podcasts.com/cancer_pulmonar_de_celulas_no_pequeasuqyzx.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/ieXjamV/29261009135.pdfIn PDF document text
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/2a987121950.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/0tjingf/dr_driving_2_mod_uptodown.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/gofuremax.pdfIn PDF document text
    • http://italywom.space/mobixepekoforuvedivigone8hg7j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipipowateselok.epizy.com/vizio_m50-c1_power_board.pdfIn PDF document text
    • http://kubagaxupusu.epizy.com/the_importance_of_being_earnest_act_2_funny_quotes.pdfIn PDF document text
    • http://girodolud.rf.gd/xuxuripumiwove.pdfIn PDF document text
    • http://xolevusafo.myartsonline.com/what_are_the_stages_of_human_evolution_in_their_proper_order.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/52343019618.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/program_spectrum_remote_ur5u-8780l-twc_to_cable_box.pdfIn 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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 5432 bytes
SHA-256: 7b72d8f99fb8e5253c57b93a5590305f341fc77ca82cb9b6a38259af44091023
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10020 bytes
SHA-256: 9b4659fd2c0ff70b4f0649fc0d8fb65e965a02ef8d6a44eb72fd3c3e95f789dd