Malicious PDF — malware analysis report

Static analysis result for SHA-256 50906deb488e12da…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 22:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43ff808e227df0431bd485af5e4c08db SHA-1: 44c0193ba0a0253204959fd4bc3a2f90a372171a SHA-256: 50906deb488e12da64a3511b263160116e8f04eb3b321891962d87598fe030d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • 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/wb?keyword=rowenta%20ro%208388%20review
    • http://salonhq.xyz/lomanekuzobagc9pda.pdf
    • https://ruputosara.weebly.com/uploads/1/3/4/4/134456906/zosowij.pdf
    • http://bilkaita.space/meetme_latest_apk_downloadqu6ed.pdf
    • https://cdn.sqhk.co/nifodotiriru/Chiajbg/lonanikewunupabemimafig.pdf
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/fosux.pdf
    • https://lewebivaduxug.weebly.com/uploads/1/3/5/3/135392118/a88493.pdf
    • http://nitesufi.sportsontheweb.net/how_to_make_your_own_crown_royal_peach.pdf
    • http://mujudesuxiropa.sportsontheweb.net/resistor_color_code_calculator_-_3_4_and_5_band_resistor.pdf
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/3454164.pdf
    • https://cdn.sqhk.co/xafiguzi/bgi7dLB/navagopo.pdf
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/pazigusukowikuz.pdf
    • http://tryadasert.online/what_is_npv_function_in_excel2b095.pdf
    • http://muzibatixabu.mypressonline.com/kukolejasixase.pdf
    • http://andyhongdigital.com/my_bissell_vacuum_will_not_turn_onog011.pdf
    • http://chelamela.org/ashraf_ali_thanvi_contribution_in_psychologyaory8.pdf
    • https://cdn.sqhk.co/pumevigatare/bzVijjo/27665003096.pdf
    • http://verefdliyvtorogo.xyz/32700272070mhxlq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://radiviwix.onlinewebshop.net/john_deere_1830_tractor_for_sale_ontario.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_off0000e5f0.bin
cd57b403c96303b219ac68d0e1650594ca02288aa7c9e57972cb9672ec1f8785
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 4988 bytes
font_01_sfnt_off0000f70f.bin
f70970eb6442820748c6423c65aada0488c37b6b4757c93f46fb8374762f627d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 12992 bytes