Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85d6eec74fc4120…

MALICIOUS

PDF

76.1 KB Created: 2021-03-05 04:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3eb12598644acbd46d678d9cbc835b02 SHA-1: df8008dd98a63ae8fd9d5369c36f3614aa0f4825 SHA-256: c85d6eec74fc4120ec50b37a4a7432a39a451cb9773761d6283232e5f295c60f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=what+are+the+different+types+of+keurig+coffee+makers PDF link annotation
    • https://cdn.sqhk.co/kigakikijebo/sjbCxhf/warhammer_quest_silver_tower_hero_cards.pdfIn PDF document text
    • http://apsmall.space/tiger_2020_predictionskwitp.pdfIn PDF document text
    • https://cdn.sqhk.co/wemigiwim/2KgjbfW/micro_battles_3_android.pdfIn PDF document text
    • http://shimano-stradic.ru/estructura_externa_de_los_textos_persuasivosz9ekh.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/jh1gcid/72530024167.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/ex2hjdO/soxijatuxidajagopu.pdfIn PDF document text
    • http://kukushpa.fun/dash_go_rapid_egg_cookerkcw07.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/hijfhcE/lovecraft_country_episode_1.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/Zjejfgu/rupeboxa.pdfIn PDF document text
    • http://trokot-online.xyz/pofuxizakirosigidexavamigncar2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_1ebe85229ee94fff91aa8da192fa801e.pdf?index=trueIn PDF document text
    • http://lekedoxe.rf.gd/natolebomime.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/2065474908.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/24522736818.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/tofadowawiwat.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_c999dc28339e4de39b08d675617f7adb.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_d814518131cd498ab38f4b63f2fb8260.pdf?index=trueIn PDF document text
    • http://tuxugev.epizy.com/cheam_park_farm_uniform_shop.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_2ca8f9296935480f86bab2975fb04a9e.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_19ee3b8b0b2f471ead527c72a4ccb3c6.pdf?index=trueIn 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_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 5716 bytes
SHA-256: 479b3c8f41ee67b25b6d7efc02462b9e54775bc73aa146073b41f2707f02f370
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10592 bytes
SHA-256: ddbf7e35941cb00581cbc5d9d7c6f91efa9ff9b911db8d0d62c546c72a925793

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