Malicious PDF — malware analysis report

Static analysis result for SHA-256 b777c61994bc508a…

MALICIOUS

PDF

83.0 KB Created: 2021-03-16 16:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8470e72185e642e565a0f9ebebb25050 SHA-1: 7f5255ff06e3ad2934696b2ae6bc3700a274a6a6 SHA-256: b777c61994bc508afaa20db75598dfb188e40e0e090062f144b5df8eb6929217
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to contain keywords related to catalogs and reviews, which are common lures for phishing attacks. No scripts were extracted, but the presence of many external links indicates an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/award?keyword=cat%25C3%25A1logo+natura+2020+pdf PDF link annotation
    • http://dororuminaxa.mywebcommunity.org/arctic_king_8_000_btu_portable_air_conditioner_reviews.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/a_single_shard_chapter_12_summary.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/lururisofuduzitisakanujo.pdfIn PDF document text
    • https://cdn.sqhk.co/jumibizede/fggDKp8/35791106236.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/fh9bfie/tips_for_scrap_mechanic_survival.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/dakajuvideledela.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/9164060970.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/SQIjghf/brasfoot_2020_crackeado_celular.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenelavup/gQ3sgGv/acceder_a_mon_compte_icloud_sur_android.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/will_there_be_a_wings_of_fire_dragonslayer_book_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/79758612-b774-4927-9c48-f60127737b5e/rabexatoninuwoz.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_da1760d3bf5248df9afa102dad7f5cce.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_2a44a303bf714937a0fa2271e3510d92.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_fe10239b6be14075842eed49e4215bd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d151f628-6f53-4971-92a5-cebfdb94bafb/fetapedaliramem.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_a9f80184f5d742fc984ecddc4c172fc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/rulezadefinexevedesezem.pdfIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/52762070036.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/jebezixivubeg.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/how_to_use_a_charter_remote.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 5444 bytes
SHA-256: b4101ccc9349c0e7d436f874f9d0ae2c04113512c9c46f35b9be5dc5ca44b031
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 12980 bytes
SHA-256: c041c3a6e4ffd8d81ce2bf3498ea16be9cc7500c657e2c7ce99dcde124e6c16c
font_02_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 16440 bytes
SHA-256: 19168f8347b937f98393cd35fe5988f6d6b7438309aea75a6b2621cbcafd9739