Malicious PDF — malware analysis report

Static analysis result for SHA-256 81abb9ae77919bac…

MALICIOUS

PDF

91.0 KB Created: 2021-05-14 23:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0a60a44f606760fd7a98164b08f22ce5 SHA-1: a8ae6a21c559e24872a4380326974255b16887db SHA-256: 81abb9ae77919bac026357959f837fa8d9bb6ee361a98acb338139b00dc0c46a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=what+is+arcane+stage+mage PDF link annotation
    • http://vuwefedope.sportsontheweb.net/zaweguwomerutojegala.pdfIn PDF document text
    • https://karivimefoga.weebly.com/uploads/1/3/4/3/134311068/d5e08ba2b6fc9.pdfIn PDF document text
    • https://mulononar.weebly.com/uploads/1/3/5/9/135959518/a370b657cd0de54.pdfIn PDF document text
    • https://dasaxurakusep.weebly.com/uploads/1/3/4/0/134017902/feselit_kevugob_gofoweziladar_sebekabuwuwuke.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/WihA9tQ/bizifovim.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/bUopagt/tanks_ww1_impact_on_warfare.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/3101429.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/2hcKgj0/sudakobomixeluv.pdfIn PDF document text
    • http://grandov.pro/98974730687i981q.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/zisinotolobufeb-dugivotovikix-febowofopokew.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/vwXDjjb/84734745319.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/wEicmji/hundred_years_war_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenerusivu/RciiNie/love_background_music_ringtones.pdfIn PDF document text
    • http://liko-sneakers.com/lubarelasodedurqek9.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/ighg5aR/history_vault_channel_shows.pdfIn PDF document text
    • http://reweder.site/kushina_se_entera_de_la_muerte_de_obitosb5fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/how_to_fix_honda_mower_transmission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca1e177-629f-491e-9a4c-8942468d4bdd/54285058284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6742cf20-8fa8-482f-830b-252451fd4e64/93632066651.pdfIn PDF document text
    • http://robefowoved.onlinewebshop.net/burger_king_gutscheine_dezember_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f43c92-429e-47e3-bcd2-9a718d27b4fa/life_books_to_read.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/detemeraxomusoxajeburi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c48c94-ad2a-41e6-804e-0190593ab1d1/70001682799.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_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 5192 bytes
SHA-256: 22597f9a9bb1cd5d95406a355f6dc3379c814aa136cca6b43e77ad350602e5e4
font_01_sfnt_off00013841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 11312 bytes
SHA-256: dfbb8ae1f53526a38744da8e27c9f7e2b4dbddf992ec4ab4ee3b3cb5a70f03c9