Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b14760bc59bb2e0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 07:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dc0cdc4ff773dcb46c97a2bc29a8d8dc SHA-1: 76b77fc2c4a8da213defca7951c80d9f874676ec SHA-256: 3b14760bc59bb2e0fc2875262e1a3ca84e144a4ef385306c71fdf4360b08dab8
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search, further supporting the idea of a lure to external content.

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 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://dugedepap.ru/wix?keyword=huniepop+android+mod+apk PDF link annotation
    • http://lorakuze.sportsontheweb.net/sig_sauer_owb_holster.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/mecanismos_de_absorcion_de_nutrientes.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/lozojelewoboga.pdfIn PDF document text
    • http://amaryllis.space/the_canterville_ghost_summary_chapter_wise_questions_and_answersb0qyi.pdfIn PDF document text
    • http://shoplus.info/bcbs_of_michigan_prior_authorization_radiologysqqpd.pdfIn PDF document text
    • http://slampochka.ru/44561552489206te.pdfIn PDF document text
    • http://menformula.xyz/sat_subject_test_score_rangeqjsyu.pdfIn PDF document text
    • http://poradoit1.site/46968145566dhru5.pdfIn PDF document text
    • http://bhd-management.space/the_paper_menagerie_and_other_stories7udfc.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/jewisuxelokavilekivole.pdfIn PDF document text
    • http://citimart.online/wupixobewavaa13w6.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://nivuzujanux.myartsonline.com/stealth_cam_sd_card_reader_reviews.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/54196964245.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/26540424361.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/femabutanadedefurif.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/99685601621.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/rekobojo.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/92714470293.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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 4724 bytes
SHA-256: 18732747f18680ccacf47d47288218ead7281e74bb055525bf97f86c511ca102
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10444 bytes
SHA-256: 90cef28a69732424691aa1bd5b5c93a1aa02b3e8cecad24292b7e45315712c2b
font_02_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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