Malicious PDF — malware analysis report

Static analysis result for SHA-256 a571e2e34adcd339…

MALICIOUS

PDF

74.5 KB Created: 2021-05-19 00:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1d233f0273658b07430642be99c33da4 SHA-1: 54a4575ab6c862cf3c7eb4afc96bddc848bf5b1f SHA-256: a571e2e34adcd339f43daa1fb82c579bdf1a07c8bbed2b253f55ad656a94245c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to obtaining in-game currency, which is a common social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+get+money+on+sims+freeplay+without+cheating PDF link annotation
    • http://kexevosizamem.iblogger.org/ibsen_catilina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_600c9c184de2f.pdfIn PDF document text
    • http://vuzeliligovitu.iblogger.org/68794381497.pdfIn PDF document text
    • http://reniloze.iblogger.org/obat_antifungi.pdfIn PDF document text
    • http://pobijubak.iblogger.org/business_writing_with_heart_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6009f6a77dde1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawatutosewo.epizy.com/91341622358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bee2637-e383-441a-b3b4-9dd79d7cea28/intermec_pm4i_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/vomekatitiredefulelu.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/how_to_pronounce_the_names_in_throne_of_glass.pdfIn PDF document text
    • http://jezuboteseg.epizy.com/77760313114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0997e855-5698-4df9-931a-dd07298de1a8/rotufolum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e534d1a-4022-4b8e-9245-a68bc6351e85/bamaz.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/charmed_season_1_episode_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64c0269-5e5c-44fc-8198-8fa83bc01ae9/how_often_should_i_clean_my_glock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a26c469-0af7-495f-88e6-41999ff3d287/59381986206.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/sulebazunawemoxer.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/jingle_bells_hip_hop_remix.pdfIn PDF document text
    • http://dukuzuwikisos.epizy.com/ansible_for_mac_osx.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5584 bytes
SHA-256: d85e8bfc31f5dff009e5878a7f63ba029322c43dc0fec493987008022654dbab
font_01_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 11104 bytes
SHA-256: 05a4bb7e7320729127994edf118e97343c7212784c4fe4ef63b6c401bd9c1245

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