Malicious PDF — malware analysis report

Static analysis result for SHA-256 244aff55c030451d…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 17:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8a30ff50fa015bfcca3993a25ebe145a SHA-1: a47750254b3f0eed76473ea9547dda34713eeabf SHA-256: 244aff55c030451de5b9dca0fe9b3cf30ff5d610dd52c29a929d6f491ba25dde
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically referencing 'Stephen king new book' and leading to a suspicious domain. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious, suggesting it's designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=stephen+king+new+book+11%252F22%252F63 PDF link annotation
    • https://cdn.sqhk.co/fepewujufa/Johdjgu/nintendo_switch_controller_cyber_monday_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/Bibudgf/83140134335.pdfIn PDF document text
    • http://lovelid.xyz/dragon_village_walkthrough7457w.pdfIn PDF document text
    • http://minuette.me/vishnu_sahasranamam_video_with_telug0ycqc.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/cjhhjgh/original_talespin_characters.pdfIn PDF document text
    • http://pestore.pro/kubenukagaminofa3kiol.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/W7VIhfr/tie_dye_sweatpants_set_urban_outfitters.pdfIn PDF document text
    • http://xetepoz.iblogger.org/sekofovaxovek.pdfIn PDF document text
    • http://meetdouche.xyz/astor_piazzolla_libertango2ujci.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/bKhcOjk/forward_line_of_troops.pdfIn PDF document text
    • http://nat-yoga.space/everyone_piano_sheet_music_let_it_gopl2ws.pdfIn PDF document text
    • http://sfr-webmail.com/bavefomemidomotaxogezk9of.pdfIn PDF document text
    • http://nutristrike-shop.ru/buwonijakodojaminukegofzbx1x.pdfIn PDF document text
    • http://idealica-uficiale.website/lesson_3._1_practice_a_geometry_answjh1gq.pdfIn PDF document text
    • http://petersikdar.com/87981142388v7gz6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujodur.rf.gd/nenivuboji.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/aambala_tamil_movie_hd_print.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/lawavozojewofenavamar.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/balave.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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 5500 bytes
SHA-256: c7c232a6f67b1f4193c1be2b939cf862028c0dd9ec4440bc092d2cf0978c6d06
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10908 bytes
SHA-256: ff34362f53473c5447f10ff3cb09484fcad716d93ec5f74c4e3834d338f269b8

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