Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd72c0cff4b63df…

MALICIOUS

PDF

79.5 KB Created: 2021-03-08 00:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e00e75585063520c18e8c0febe3e5d8 SHA-1: b11da5b531dd815cd1b6d0257d5fd589f141cd48 SHA-256: 4fd72c0cff4b63df1d4d84805e013692f018dbbbf832ae95c653a194d502c346
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=urbanization+graphing+worksheet
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/widugafuze.pdf
    • http://gudutisiluzew.mypressonline.com/38360881052.pdf
    • http://power-guard.shop/corrugated_galvanized_steel_sheets_for_roofqkkhe.pdf
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/8815873.pdf
    • http://tuzogat.sportsontheweb.net/how_to_start_my_karcher_pressure_washer_k4.pdf
    • http://wijofotezopadik.medianewsonline.com/star_citizen_ships_in_game_price_3.10.pdf
    • http://detonic-italy.website/rijozojorosevulopitu9qnb8.pdf
    • http://hookup153.space/how_to_connect_anker_keyboard_to_iphonepv0ko.pdf
    • http://xabibumat.iblogger.org/definition_of_forms_of_business_organization.pdf
    • http://fofolep.mywebcommunity.org/65730047431.pdf
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/5eb6809.pdf
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/semifamamibabuj-gireg-todalafipijevi-vupokorob.pdf
    • http://kiwenalod.medianewsonline.com/super_mario_bros_2_walkthrough_3ds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_2f886de297f84807af099c85b3631d5a.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_3b0d5c9b9d9b42768e0127766afdc64c.pdf?index=true
    • http://rogomore.myartsonline.com/pitamefexoxofujimejev.pdf
    • http://rabatelekovufar.myartsonline.com/xodimirezezesirerabebi.pdf
    • http://zudujijikaj.rf.gd/wopobadivotibokalip.pdf
    • http://fegozovot.rf.gd/computer_hardware_and_software_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000face.bin
5161415fcb50e25670c531e84143237d10801699e911410cd6a65bcb21fb42eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 5388 bytes
font_01_sfnt_off00010d36.bin
578711b43229d35054e2f3a22ce68102e5b273ce865f357d583b093e9abf6fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 10392 bytes

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