Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b661f9720c6cdc4…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 12:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad75da01e53e7e20dbc25d0882ea5850 SHA-1: 520edb2cffd9e23b1e0ae43bd088afaf576cf492 SHA-256: 9b661f9720c6cdc49e437f4f8276d9653644d2b633a3748930de0d01cf134bf8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=nauka+angielskiego+pdf+chomikuj PDF link annotation
    • http://xaredazisom.mywebcommunity.org/aula_de_violo_para_iniciantes_gospel.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/ym0IicC/16661024981.pdfIn PDF document text
    • http://xunarepozufuz.mygamesonline.org/bestiary_pathfinder.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/mif7hdP/fruit_chocolate_cake_cooking_with_sugar.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/hsWjcjd/wish_grammar_worksheets.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/mugalixidajuli.pdfIn PDF document text
    • https://cdn.sqhk.co/sawusuzi/jgiheib/tujaxadowejetapuvokibadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5ffa45d3419a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5fea2e4b8d650.pdfIn PDF document text
    • https://cdn.sqhk.co/xadelakora/gPjg8hh/sky_force_anniversary_ps4_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384461/normal_60047d28725c7.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/jzLjbbw/wish_app_store_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405440/normal_5fdd0549ac676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426701/normal_5ff772397af17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/zuxalajoxiwebekesuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/how_old_is_seth_gold_and_ashley_broad.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/final_fantasy_x_sphere_grid_guide_tidus.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/88929963405.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_80867a14e43340d1b3d6025819159bce.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_ea591a324eb94ff688bcf302da5e8b85.pdf?index=trueIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_e5603a8d09ab45149c2037e29d04c896.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_ede62459585e48c588c9241db63fa424.pdf?index=trueIn 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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 5584 bytes
SHA-256: 2857fba29089f6490ed432574ed6be34e44933e9198f3568d1d971ae07efdd9b
font_01_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 14668 bytes
SHA-256: 77f32cf856f2f29a1a146406213166b2e0d8eecef2923021b1ee633083371edb