Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60b2c8be82883f7…

MALICIOUS

PDF

111.6 KB Created: 2021-03-03 04:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 99a44e643cff55dc634dc066d3cfb6d3 SHA-1: 9b8d9d3a185a74f9796f7168f0f646e0b4886fc4 SHA-256: b60b2c8be82883f780d59f8a88c32cdbfdab6c53ac967efa1b422b8362d45a5e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a 'guide', reinforcing the lure. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

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://nipisod.ru/wix?keyword=bg2+npc+guide PDF link annotation
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/1b069.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/ridozu.pdfIn PDF document text
    • http://fullstacket.online/resumen_del_libro_el_guardian_entre_el_centeno_personajesulw1y.pdfIn PDF document text
    • http://pannochki-art.com/ti_84_calculator_online_freec26hy.pdfIn PDF document text
    • http://vereffka.xyz/kujafefapuragklar.pdfIn PDF document text
    • http://noverst.xyz/sdgs_17_goals78n5o.pdfIn PDF document text
    • http://clientesdkb.com/guatemala_travel_guidehhwcr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_601cddb203379.pdfIn PDF document text
    • http://feedbacrnz.space/novunovududawilawamilwionb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_6039cad86b53d.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/what_is_the_theme_for_the_story_thank_you_maam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390051/normal_5ff5205d4d23c.pdfIn PDF document text
    • http://todegapevaja.iblogger.org/vb._net_2010_professional.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485301/normal_5fcdbcad59dde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexidolovosope.rf.gd/rakujemenuwaduzepowud.pdfIn PDF document text
    • http://nunoxemimo.rf.gd/29467724999.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_off00017d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D9D 4904 bytes
SHA-256: d64064b8a7e7ea3153879e31bb6634b593bd385b768320b4b581e5d80706bf7b
font_01_sfnt_off00018e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E70 10240 bytes
SHA-256: 0e031c7d0176a340fbecfdfaf3a053a2c0e29789c5855a36242be26b6c6e7969

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