Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4445f2bf53777b…

MALICIOUS

PDF

88.0 KB Created: 2021-06-09 13:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f9edec7c703ec19bf8d09077dd1991c SHA-1: 29b50c270d7fbfdc0e4eca5c1446bc7786291795 SHA-256: 4d4445f2bf53777beeaff5526c24c01c2cdb9bbcc024e21233833e7ca2f3fa6d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support malicious intent. The primary URL, 'https://allytemp.ru/pbw?utm_term=invisible+space+copy+and+paste+fortnite', suggests a potential phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/pbw?utm_term=invisible+space+copy+and+paste+fortnite PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421342/normal_60315754c0212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_6032e46639b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5fe8cd77ddc6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6057ac495cf1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404292/normal_6027b6c59519e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_60661cc171917.pdfIn PDF document text
    • https://xokejajolaliz.weebly.com/uploads/1/3/4/7/134718337/pajewuvisotu-pofatu-lowiketitudiso-ganaseruzetugif.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/1663272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5ff0c5e41d068.pdfIn PDF document text
    • https://rilolani.weebly.com/uploads/1/3/4/4/134459611/763852.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/1745870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_5fd657a630d22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibosopimugo.pbworks.com/w/file/fetch/144630126/worubogeti.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/best_buy_san_antonio_forum.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144632760/fufobejuba.pdfIn PDF document text
    • http://redejok.pbworks.com/f/pehli_baar_dil_ye_bekarar_hua_hai_hd_video_download.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144648891/40041137239.pdfIn PDF document text
    • http://tejuzedipebu.pbworks.com/f/wanuduriwole.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/ferupopemovomaruzuka.pdfIn PDF document text
    • http://domewisisu.pbworks.com/f/how_can_i_get_my_deleted_whatsapp_chat_history.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144436626/how_much_area_can_a_wood_stove_heat.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144696459/folafofav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 2840 bytes
SHA-256: 1eece0cfdb445686a960631be763a2e9201333fac99d21b2a9070aab52364a3f
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 5388 bytes
SHA-256: 92ae165ce7d05bac910c1e56129446182b394caef51ead507768e6b13f7d56fd
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 11000 bytes
SHA-256: 04271e7c8a422d1fb5eafef3a86d384ae12da210e4ba8cc2fd783ea2758035bb
font_03_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 18208 bytes
SHA-256: 9a6c91a2df6286c877dd833d1d66312e1abfb7d95e88a61c0d4ef4517a855f1d