Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dc5b18998c3da6…

MALICIOUS

PDF

91.8 KB Created: 2021-05-11 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 192047fbef2f4ef2a2e3e00270c45bcc SHA-1: d4f988d25fc24c3e404165bf845d0d5d7f30c8dc SHA-256: 39dc5b18998c3da6ac49f14085704aa7ce367c30714a613b81309cacddcc420f
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and numerous external links suggest an attempt to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=official+star+trek+cooking+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/kugefiruxat/bcjIqj9/counter_terror_attack.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/eQYijhi/truck_simulator_usa_nintendo_switch_review.pdfIn PDF document text
    • http://lorinov.22web.org/rulizesamilajazubotudewev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fe00a0c210d9.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/pge4rbr/sales_strategy_presentation_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/gdhiLUr/repapodevuzitevijixofa.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/673632.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/h2luVRO/komiwigawiwawajidedapof.pdfIn PDF document text
    • https://fibusoza.weebly.com/uploads/1/3/0/7/130775704/wogemubaxunifola.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/pujesovinusejag.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/2siUMha/50696014622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_603ff26812c62.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WKrO9YQ/word_pets_free_word_games_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/hjhd8ib/1395739636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosefiwaniw.rf.gd/verb_preposition_combinations_exercises.pdfIn PDF document text
    • http://sisurafuza.epizy.com/gipifomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878f7ac5-3769-48bc-9acf-a926e6224c24/how_to_keep_a_guy_interested_after_sleeping_with_him.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be002bd2-c1b8-4e52-a311-fce5188df5c9/vulugatumadokepi.pdfIn PDF document text
    • http://molodetagako.epizy.com/the_5th_wave_final.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b0eda6-2c31-469f-993e-ea56c87d0abd/zone_4_pittsburgh_police.pdfIn PDF document text
    • http://sebebajo.epizy.com/30252659339.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 5564 bytes
SHA-256: d4992da56f317fd471262a3d0e21cfe70c7f7ccbe219f7f09b32dd27c41ab4fb
font_01_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 2068 bytes
SHA-256: 3e1960f51353a96eca0dea43c810d0705bc61967852e5b78b5173299e7cc3f6b
font_02_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 12124 bytes
SHA-256: 38f31fed26f4f006c91cbaabfd540753382ff8e95f0cc45cd35933a7cebf79c0
font_03_sfnt_off00014b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B40 16392 bytes
SHA-256: 8d9529fca8e49fd747a132c86257b3f003f6793d9f50918e3e02e184cbe99d44