Malicious PDF — malware analysis report

Static analysis result for SHA-256 a805e54f21714e42…

MALICIOUS

PDF

112.1 KB Created: 2021-03-02 07:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e978cfb1bfe8a45e0e64882cfc526f4 SHA-1: d4b3f7f0d1d34ca38f17f36f285684223fe7701c SHA-256: a805e54f21714e42dfa07de47730052dd07c4bcb8b356eb37e6474afcf46c86f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of external URIs and the overall structure point towards a malicious PDF designed to redirect users to potentially harmful sites.

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://jottigo.ru/strik?utm_term=bradford+of+plymouth+plantation+pdf PDF link annotation
    • https://cdn.sqhk.co/fudimesa/bgcjihe/fitbit_sense_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/mefivujosawo/WFigLic/best_open_world_games_ps4_coming_soon.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/BjdCtDu/xumanutisizotetotibu.pdfIn PDF document text
    • http://creditscorecard.info/romeo_and_juliet_act_1_scene_4-5_summaryjjxx6.pdfIn PDF document text
    • http://maliwalilaz.22web.org/how_much_money_do_reiki_masters_make.pdfIn PDF document text
    • http://limecash.xyz/26506362240i2yau.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/ifoUjsS/vr_cinema_3d_oculus_rift.pdfIn PDF document text
    • http://hh666o.site/58132803979d3g8l.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jgdx222/105465606.pdfIn PDF document text
    • http://pimamunoper.iblogger.org/729488259.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/icogihd/how_much_does_3d_house_printer_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukejujegu.epizy.com/32884884172.pdfIn PDF document text
    • http://bapemadozogew.rf.gd/99616214004.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/irregular_verbs_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/60139005274.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_off00017c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C30 5252 bytes
SHA-256: 1cb62127514908b5a7e213433d9a8dfa0638739fd55e88fb8b663ae932ec2f9e
font_01_sfnt_off00018dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEC 11092 bytes
SHA-256: a37aa41162c464eab543f3f271372b1f050c5f8cf96f0ef73a6a605568ca7559

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