Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbf2b16bae4dbaa…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 12:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2fd18250e3beb20862718cdb8d0b3a7b SHA-1: 4cf95f23891299531eb2b8708d352874d1f99b5b SHA-256: 4cbf2b16bae4dbaaa09d565fe0d1dfcc7f68f5c837f1d3b13f6a0ec94d4e0a92
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to external URLs, one of which is `https://lozipotod.ru/strik?utm_term=how+to+say+thank+you+lord+in+yoruba`. The presence of numerous external links on disposable hosting suggests an attempt to distribute malware or phish for information. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=how+to+say+thank+you+lord+in+yoruba PDF link annotation
    • https://cdn.sqhk.co/nudotunaza/hicWggl/63882935511.pdfIn PDF document text
    • http://itdiscount.pro/xusalitokotaduwovekonicjnli.pdfIn PDF document text
    • http://laura-egorova.ru/action_games_for_android_uptodown48rm3.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/etYghgj/tourist_guide_tour_synonyms.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/ghu7jbh/fern_flower_shop_columbia_sc.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/gHghaij/gudekuvosape.pdfIn PDF document text
    • https://cdn.sqhk.co/tixelila/aKjcgjo/uncertainty_principle_equation_mass.pdfIn PDF document text
    • http://italywom.space/79801569188kvw2f.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/uzHagjw/where_we_go_pink_live.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/euicrKa/glitter_lol_doll_unicorn_coloring.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/lwtjcE5/90466834199.pdfIn PDF document text
    • http://hh666o.site/andaman_nicobar_islands_travel_guideiknsl.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/nienijY/90145052914.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/dhihhij/scent_of_a_woman_speech_by_al_pacino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_59c8ee8931274c9b804cd5d800133b86.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_678502eedd8246d4a6361914afb3e754.pdf?index=trueIn PDF document text
    • http://wodutedemozaw.epizy.com/6th_grade_language_arts_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/renelipomopumagusulama.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/how_to_login_to_apple_id_on_macbook.pdfIn PDF document text
    • http://nekexixi.epizy.com/majnu_kannada_movie_songs.pdfIn PDF document text
    • http://biboxafidalus.epizy.com/toloribekesi.pdfIn PDF document text
    • http://lolukojalima.epizy.com/zaganiso.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/chainsmokers_hope_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/sunepozidadufasifupeviwo.pdfIn PDF document text
    • http://vitusaw.rf.gd/behringer_xenyx_1202fx.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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5272 bytes
SHA-256: 3ac272a2a8496d0c4fadc69585bda87f4636f334695f2be011b263037487bf74
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 11560 bytes
SHA-256: d45b4aa5529697d42f423ee518fbb6be6e376c42481c5ea25bad33671829bd74