Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91216cc52e775de…

MALICIOUS

PDF

72.9 KB Created: 2021-04-08 00:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dbfb2a6615277232d71f75bab07c51c1 SHA-1: 57a47c678bc703cfe095553d734851424192b010 SHA-256: d91216cc52e775de24c775f46f2927058ac013aeb413ed0e17517552cafcf611
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'Hewlett-packard hp elitedesk 800 g1 twr drivers', suggesting a lure for users seeking hardware drivers. The presence of numerous external URIs, many pointing to disposable hosting or link farms, further supports a phishing or malware distribution scheme. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=hewlett-packard+hp+elitedesk+800+g1+twr+drivers.

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://vilenefex.ru/strik?utm_term=hewlett-packard+hp+elitedesk+800+g1+twr+drivers PDF link annotation
    • https://cdn.sqhk.co/gukugifixija/fgjijha/paw_patrol_everest_badge_template.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/pedezipaxafivomadifuv.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/il_cacciatore_di_draghi_tolkien.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/ccim_bums_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwibinewife/ggDgfid/gavajekagiz.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/hfzOjgA/post-_it_dry_erase_surface.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/aluminium_6060_properties.pdfIn PDF document text
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/buvolaxukinu.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/39687501935.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/6392872.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/star_trek_enterprise_ships_of_the_line.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidegaf.atwebpages.com/participe_prsent_adjectif_verbal_exercices.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/sokegupoke.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/bupolu.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/how_to_reset_a_fitbit_flex_two.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/63156253545.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/sql_server_interview_questions_and_answers_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/60834324678.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/bilusobewesofovawop.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/wakedavojiguriwim.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/fly_sheet_for_sweet_itch.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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 5932 bytes
SHA-256: dbf9e0e7946255521672826fdb91ac35293e24a5adad07455302b6b264ba15d4
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10748 bytes
SHA-256: 48de287604a9466640658bfdc75c6e634cdf67459f9c84ac5b4140feeefceb45

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