Malicious PDF — malware analysis report

Static analysis result for SHA-256 da21e96845bc2986…

MALICIOUS

PDF

76.8 KB Created: 2021-04-01 18:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b3d767c08f9633670197b56d14b29068 SHA-1: b3361b9df8b6731a05cfbf49d9204ee1d540dc54 SHA-256: da21e96845bc29867531879af31f382a4fa059ec2fdaf5e109dae637ca81493c
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 0.9998

Heuristics 6

  • 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 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://gimoguvi.ru/strik?utm_term=how+can+you+fall+in+love+again+with+the+same+person PDF link annotation
    • http://spainsale.pro/philips_norelco_rq12_replacement_blades_for_sensotouch_3dutm5q.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/gg66vgf/toon_math_endless_run_and_math_games.pdfIn PDF document text
    • http://samelike.site/carl_sagan_cosmos_episode_1_the_shores_of_the_cosmic_ocean_1980z1h3i.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ijabjgG/zesajetobuvosebaluxa.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/mW8uCme/97454439116.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/agAgdhb/40767450917.pdfIn PDF document text
    • http://net-klientov.ru/tugiwomozotirufansjkw2.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/HQ4zid4/jigoro.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/gijc3hh/lokicraft_download_for_windows_10.pdfIn PDF document text
    • http://redtea.space/50326307404qppta.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/dihhfib/doom_eternal_doot_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/dzjc6dR/flat_pack_cupboards_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/figthjk/car_racing_game_4x4_off_road.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/YI2Frha/2915162790.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/ijhighQ/4242178179.pdfIn PDF document text
    • http://netewe8.xyz/991908712871twag.pdfIn PDF document text
    • https://cdn.sqhk.co/jifonakilux/xgchcZK/70924647492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_6bb5a77150c549399213747197a41838.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_4b9e41c0bbdc4746a56f8464d89cd6ce.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_aa7901a707fd434586782580758fce15.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_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 5644 bytes
SHA-256: 6b20a7282f28d77fe4f08d59f5fd07cc20865e4eabca4c4c37cc6078f5029cfc
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 11048 bytes
SHA-256: 6855f5726cdb2520a1f7ededbb0019d2adc32cf1d640433978ef2d111c6f9e06

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