Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde5a5e982c877de…

MALICIOUS

PDF

73.7 KB Created: 2021-03-11 04:38:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 728859bd88dec04995b84b81c7d8f1f1 SHA-1: 3c80de1d2eecc43e4297222e5e5cf07a00756b4c SHA-256: dde5a5e982c877dedc1d2cc47c93bf1d98efbc395dc9ad273ce1979ea441562f
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=nfsi+study+guide PDF link annotation
    • http://justamorem.com/jajuzag0n72d.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/jhhTbic/hearts_of_iron_4_dlc_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/janogoxuke/gRjhKbo/nearby_friends_app_download.pdfIn PDF document text
    • https://mujonesaxofifi.weebly.com/uploads/1/3/4/6/134680030/2032043.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/dir-615_c1_dd-wrticrif.pdfIn PDF document text
    • https://tizizuner.weebly.com/uploads/1/3/1/8/131872037/4672502.pdfIn PDF document text
    • http://smilex.club/free_gospel_sheet_music.pdfgjupr.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ihbGCh7/bombay_dyeing_merger.pdfIn PDF document text
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/1d266036e44.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/befure.pdfIn PDF document text
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/xivolufopirowi.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/22109103732.pdfIn PDF document text
    • https://gutalekosipotix.weebly.com/uploads/1/3/4/3/134351461/wemukuto.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/df1695b9a9.pdfIn PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/xomujefiloden.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewawisu.onlinewebshop.net/hernia_inguinal_cirugia.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/ripufawuregavi.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/analogies_worksheet_high_school.pdfIn PDF document text
    • http://vomajifinudunu.epizy.com/vonewigolatikakiro.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/clinical_oral_implants_research.pdfIn PDF document text
    • http://lamuverifob.epizy.com/zageferuzagafixig.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/cara_bookmark_online.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/agricola_family_edition_solo_rules.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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 4808 bytes
SHA-256: 1a0a721dde5f6d2925148d01c7ade9dcc39c95600b9672ef3596e4270d362197
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 10064 bytes
SHA-256: a5acfed7a399694466e07c4dd5d47ec04e13ac6bbce99b96782fcd11f8a244e2

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