Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e468537dfb8e2d6…

MALICIOUS

PDF

83.9 KB Created: 2021-05-16 01:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a2f99aa87d7d1c006f562058155bd36b SHA-1: 250b5fe1ad983b0f3d02cebf7bb53c8a56310365 SHA-256: 9e468537dfb8e2d605de57bfdbe2a3b88c1e1a54bfbbd4f7e79cbf386e054004
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution scheme.

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://gimoguvi.ru/strik?utm_term=security+analysis+benjamin+graham+second+edition PDF link annotation
    • https://cdn.sqhk.co/vemosoveveb/jxvWZFY/30_day_home_workout_plan_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5ff1fe041ea93.pdfIn PDF document text
    • http://normab-id.com/ganenopuforiwitumexiwigqm6.pdfIn PDF document text
    • http://ig-about.net/nepuxutano35r8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_603e0b8e9ff66.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/cghdHbh/play_zombie_shooter_games_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_60484e7c754bb.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/gewovulibuz2v7mw.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/hbY1iiu/javusevejevijituf.pdfIn PDF document text
    • http://moitender.org/sceptre_32_inch_tv_standvpe3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_601637a3bef11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_6059025551037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_5fd14afdbe960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375357/normal_5ffbb66d59ecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374979/normal_5fff60d87d858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_600e49dda472f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_606bed912e1fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fdf487d0a64d.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/76e21386-1e2a-4a6e-8e6d-56f58dc83bcd/how_much_does_kirby_battle_royale_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a90215-3349-4bc0-ab66-349c417c239c/long_island_railroad_prices.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_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 5776 bytes
SHA-256: ae6f55924212c8a70a8315fe261d37962b2cc0dec4231d09375895be8503beb8
font_01_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 11328 bytes
SHA-256: a84d5217c0a2eaa98c13cdf3076a16ea5f4f13fa653d7f5b922842ff5078f769

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