Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab791f718f49ba3…

MALICIOUS

PDF

85.3 KB Created: 2021-04-17 02:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95fa713b35ff8385e467d82c9d65f0c0 SHA-1: 9d3a69babd6b782c8da418951ca644d3518e5070 SHA-256: aab791f718f49ba3f0a289d5ed49a999d675ac8d9d598a48bd4b23b78f367d40
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs point to potentially malicious content or further redirection, and the document body's garbled nature suggests it's not intended for direct user consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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://dafemum.ru/strik?utm_term=romeo+and+juliet+act+1+scene+1+themes
    • https://cdn.sqhk.co/gituxogud/jhbjcXu/download_farm_zoo_bay_island_village_mod_apk.pdf
    • https://sapobukemofox.weebly.com/uploads/1/3/5/9/135974899/8422833.pdf
    • https://rezibufebaxiban.weebly.com/uploads/1/3/2/6/132695258/8855162.pdf
    • https://bifitulodagox.weebly.com/uploads/1/3/6/0/136081839/f12ff04ec1f8.pdf
    • http://ratubave.22web.org/happy_birthday_video_maker_online_free.pdf
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/2964613.pdf
    • http://sakulog.sportsontheweb.net/will_star_wars_have_another_trilogy.pdf
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/gezeretivopov_pelerowa.pdf
    • https://cdn.sqhk.co/raguwubives/j3Qhhv6/monster_high_music_festival_venus_mcflytrap_doll.pdf
    • https://cdn.sqhk.co/besogevipadi/icibtQu/rodogeko.pdf
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/buvawoneke.pdf
    • https://cdn.sqhk.co/tovozovuzedu/Ejgjhjc/extreme_bike_racing_2019_mod_apk.pdf
    • https://sizadomuwegemos.weebly.com/uploads/1/3/5/3/135335556/lusazuremijufox-newozajitaf.pdf
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/e0e4725bd11df4.pdf
    • https://cdn.sqhk.co/pifizumux/jh7gdih/18718862766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_44fca3ab80d7499396c5f25c7d42c7eb.pdf?index=true
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_7855713dae2a4b0c9c7ff8cfa36a2931.pdf?index=true
    • http://wisigisovet.rf.gd/58816757148.pdf
    • http://josunida.epizy.com/12551373305.pdf
    • http://gigidubuvo.epizy.com/xerukegud.pdf
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_d20825aebb8240aa8e4e843e4aa4c24f.pdf?index=true
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_c3de98722a4c446e8c8ee40684070a2b.pdf?index=true
    • http://gobofitis.epizy.com/zoborifo.pdf
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_e1f680112d7e4df48c0164358bb47c77.pdf?index=true
    • http://tevaluzax.atwebpages.com/halo_ghosts_of_onyx_free.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_off00010c1a.bin
dc7a0ac633f66ddeb252e2c7d64d3bfc43b51b205fb0f843b981f07c6707ab43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 5216 bytes
font_01_sfnt_off00011dbc.bin
bb5ed31f8d0d012ef2a20134dc14a6bb29fffeb557e1a372d9135683c1e9fbed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 12052 bytes

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