Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c10715cd0f8ee8…

MALICIOUS

PDF

113.5 KB Created: 2021-04-02 13:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea5e830087bd7e139172b4d0b9a4d1f5 SHA-1: 66a58e4526cee1b7835efae2a06a59a86cc4f64e SHA-256: e9c10715cd0f8ee8d128bdb481b90a5d8afdb5f1aeaf8052511b2abe3dcaa1a5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=ali+baba+and+the+forty+thieves+book+pdf
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/fiseditefono_neviwe_rifekemukiwa.pdf
    • http://kismyketio.com/daily_driver_sfc8lji.pdf
    • http://smm-target.ru/ft_450d_manualfvkkf.pdf
    • http://powerhdniy.space/how_to_connect_bluetooth_to_pioneer_touch_screen_radiota3nb.pdf
    • http://legendarycraft.ru/asus_sabertooth_990fx_r2.0_motherboard_specs_windows_10lr1vi.pdf
    • http://trenolgia.buzz/material_design_bootstrap_free_templateayi3u.pdf
    • http://dreabling.online/nipenibefigabezuxikazipax9oxg.pdf
    • http://wufusigemaxegok.iblogger.org/autonomous_car_book.pdf
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/1387463.pdf
    • http://wekeb.space/28321214301p98cg.pdf
    • https://tenewalewufubin.weebly.com/uploads/1/3/5/3/135329800/narel.pdf
    • https://bipurubozebupal.weebly.com/uploads/1/3/6/0/136082727/a4312.pdf
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/dovomop-vagotod-jonixewod-takovokuzazej.pdf
    • https://vozupawugenebib.weebly.com/uploads/1/3/0/7/130776609/7937670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zisekajoreva.epizy.com/dabomajifelebuvogudoro.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_492674c57a6d4803a2fe6b1276d5256b.pdf?index=true
    • http://wilirumam.rf.gd/74309230391.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_294eef51198e432791d76b446b7bf9e9.pdf?index=true
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_fcf043d21841416b97569945b2501c55.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019903.bin
3aaab3b167f944988c23a867224653f3686c93dc075e684940acfdc8137bc2e6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19903 19304 bytes
font_00_sfnt_off0001639c.bin
19501f2895ab652ae1a817b738f3d1a65208f3028322306fc3933d1822fc81dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1639C 5484 bytes
font_01_sfnt_off00017642.bin
257c72db20cd1d2388b0f85f046d55b1b0521c73a15c8c63755b2f47eaed6b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17642 10064 bytes

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