Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c08fa971f6827b…

MALICIOUS

PDF

71.9 KB Created: 2021-06-09 02:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e2eeaa28885a50200e2604742bd1c395 SHA-1: f34f785a04cd0fd0d6f7744ff2e819c015d790b6 SHA-256: 58c08fa971f6827b1e1a1684b10f1542965b7b7285b50f98b86020f4e29b8a1b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to 'case files internal medicine pdf' and is associated with external URLs that are part of a link farm on disposable hosting. These elements suggest a phishing or malware distribution attempt, likely using the document as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/pbw?utm_term=case+files+internal+medicine+pdf PDF link annotation
    • https://gudufuremozowa.weebly.com/uploads/1/3/4/4/134403830/40fa88e.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/baxupurideb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460071/normal_5fea10c239cf7.pdfIn PDF document text
    • https://bibasalerudo.weebly.com/uploads/1/3/1/8/131857029/5672043.pdfIn PDF document text
    • https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/3604088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_604e1248c89ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_604191acccc39.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/1933959e-ea7e-461d-aef0-273eb7f96307/26127192973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5412ff-f04a-4ee0-9deb-3db0404ef958/hp_4500_printer_cartridges.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144428646/foniwuzimuse.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144489366/price_of_rapidex_english_speaking_book.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144898572/signal_words_to_compare_and_contrast.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144419196/modern_spanish_grammar_download.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/city_of_stars_duet_sheet_music_free.pdfIn PDF document text
    • http://jetubabup.pbworks.com/f/13259917347.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/magnifique_est_le_seigneur_partition_piano.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144764607/attaullah_khan_songs_old.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/w/file/fetch/144818607/circular_motion_worksheet_with_answers.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/can_i_get_roblox_studio_on_mobile.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/kebig.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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 3048 bytes
SHA-256: 0f5195cbb96eba5caa7877e43826103b28f8acb52b83143f9424ab932370000a
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5208 bytes
SHA-256: b186bfe79cd36c11c090eed548fe33148dd73e7f22323654d9a77e37914ce76f
font_02_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 11952 bytes
SHA-256: f77881f1bef7ba95448ad85a62b8d87142b3f5fc7895f7fc61df0097f3f71b23

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