Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83d98a737fbc5ef…

MALICIOUS

PDF

77.0 KB Created: 2021-03-08 18:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f4d42c81ab7a5c8d568a73b3a315c148 SHA-1: 7b1d097d62464c308a254f201ca67e29764be555 SHA-256: f83d98a737fbc5ef3d9b83b856c16347cbe0d7404f431a86a9cb30d8b17324b0
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with a high number of embedded external links. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to manipulate search engine results or redirect users to malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://bologen.ru/award?keyword=comment+fusionner+des+pdf+avec+mac PDF link annotation
    • http://sidikapefujuxe.22web.org/fogog.pdfIn PDF document text
    • http://wizagulonas.22web.org/remote_control_android_device_over_wifi.pdfIn PDF document text
    • http://zonixutazexe.iblogger.org/bevuxap.pdfIn PDF document text
    • http://zivarejewetuga.22web.org/apple_watch_4_user_manual.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/vomekovukidulipijor.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/piraloz-lagujawoxoxoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nimuwet/divodip.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/14184542630.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/65563018370.pdfIn PDF document text
    • http://loxometos.epizy.com/believer_instrumental_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/bash_pocket_reference.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/mupituvow.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/21721308208.pdfIn PDF document text
    • http://latarugumajovi.epizy.com/65754092078.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/whatsapp_good_morning_good_night_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/ap_human_geography_prep_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/98531363213.pdfIn PDF document text
    • http://sakamajuxuga.epizy.com/cariloha_bed_sheets_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/british_open_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/19089826405.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/hastelloy_x_sheet_metal.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/buried_hook_fly_fishing_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/what_happens_when_the_id_ego_and_superego_are_in_conflict.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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5236 bytes
SHA-256: 5a3368bfd8d024a5d38d4cf1c4edb0177e8a9b3f913474d77ae8d8c0cf8e4141
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 12108 bytes
SHA-256: 720591d0200d7f53b17035a289942f0d2a086418137adfb5376968c4a87ef064

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