Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4533252755c6ec5…

MALICIOUS

PDF

75.1 KB Created: 2021-05-07 13:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9c76fdfb4dd02ce9ec2b43792eb6b9c3 SHA-1: 5300f591b03d94b3ff67b1a795973a5424dc9a5a SHA-256: b4533252755c6ec5d0b7c79beef2fe3319240d20fabebba368b4abcdadb50f9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=bosch+vision+300+series+dryer+not+heating PDF link annotation
    • http://workshop-fb.ru/cute_fox_wallpapers_for_iphone1pgok.pdfIn PDF document text
    • http://ozalupa.space/cuddledown_impressions_sheets58ohq.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/3a506247e9.pdfIn PDF document text
    • http://heartcenteredequestrian.com/kefazitiguvabaduxsltj.pdfIn PDF document text
    • http://kprovk.xyz/xofavosofepajojanutemzsxu.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/p5rghih/46685182923.pdfIn PDF document text
    • http://scandisvet.ru/1_dm_cubico_cuantos_metros_cubicos_son03wbh.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/5108137603.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/95462358569.pdfIn PDF document text
    • https://moxisubisoxotap.weebly.com/uploads/1/3/4/8/134893280/xirijojususifidolu.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/canavalia_ensiformis.pdfIn PDF document text
    • http://katermore.ru/betternet_vpn_chrome_extension1xouu.pdfIn PDF document text
    • http://medicinfo.online/ritugojarexaverqko72.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/jjgjcoF/vuwuzesikumejafogisobaz.pdfIn PDF document text
    • http://korecos.ru/acca_f6_taxation_study_text_2019uvidr.pdfIn PDF document text
    • http://chunyoo.com/how_to_fix_broken_sliding_glass_door_lockjg4og.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/mesixepaz.pdfIn PDF document text
    • http://9gusevshop.space/1530399634671m7b.pdfIn PDF document text
    • http://idealslimitalia-official.site/31575779467uz2vv.pdfIn PDF document text
    • http://4gusevshop.website/jaxuxoxadajevogokes10e8s.pdfIn PDF document text
    • http://reduslimitaly-official.website/royal_adelaide_showbags_guidebolah.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/jbGjigg/find_my_location_iphone.pdfIn PDF document text
    • https://xitodilizunew.weebly.com/uploads/1/3/4/1/134108755/jemaxigover-jurirolalebexid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vujuvisesakok.myartsonline.com/45740947749.pdfIn PDF document text
    • http://benamow.myartsonline.com/how_to_clean_printer_nozzles_epson_dx4400.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 5472 bytes
SHA-256: fe0262de9de20dbbf7626e13193a543b075ce5b828c1a34cc5c40ed2c52930c8
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10228 bytes
SHA-256: 3e217229d13467dee485f2cc4388ab6fa0c406f921d5e175937811a74200b94f
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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