Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f5989d1dbd49d7…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 18:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4e85ff7309892f7b44c4ebe5caae73d4 SHA-1: 1a19682b806b72197fcfc1d7692fe8dd36afa7ac SHA-256: 81f5989d1dbd49d78dae525fc25f9da27ff0f93bdb1e638671746694f8466265
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a malicious phishing document. It embeds external URIs, with the primary suspicious URL being https://kuzutuzo.ru/award?keyword=logarithm+and+antilog+table+pdf. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/award?keyword=logarithm+and+antilog+table+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448558/normal_603b4aa16c954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6020bbc87cec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_60477c3b2a6ea.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ibjcxic/entrepreneurship_development_in_food_processing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_5fe934c8c4c8d.pdfIn PDF document text
    • http://jelesanu.iblogger.org/20386471018.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/hgIgek1/kawuxememukexabipoduvonil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd686bad403e.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/jjjgibM/rolly_vortex_game_play_online_free.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/99362269405.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/gghghew/doubly_linked_list_time_complexity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexubadisaki.rf.gd/general_affidavit_form_new_york_state.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/dotupasodezer.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/datesheet_of_compartment_exam_2019_class_12.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/aliphatic_electrophilic_substitution_reaction_mechanism.pdfIn PDF document text
    • http://lelisavebak.rf.gd/asuran_tamil_movie_bgm.pdfIn PDF document text
    • http://ritanuwo.epizy.com/all_branches_of_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/jijokunomujuresigupozibe.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/aprender_a_dibujar_a_lapiz_paso_a_paso.pdfIn PDF document text
    • http://bomatep.rf.gd/tibefusanigajatotuxuxudul.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/music_maker_jam_pc.pdfIn PDF document text
    • http://zavinawotomuvef.epizy.com/xizejobowoxevuwopip.pdfIn PDF document text
    • http://xijuroluzuka.epizy.com/55067674931.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/expos_sur_les_catastrophes_naturelles.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_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 5360 bytes
SHA-256: 3b7f190f9677392670f49d986e2f6b681ec828b375b6960d50fc34871b4c7b84
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 10940 bytes
SHA-256: bac8b346684825b81c1b27bf19635cefe570486218034da0e5723c55982f1bff

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