Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba164788dee240d…

MALICIOUS

PDF

97.5 KB Created: 2021-03-14 21:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7423cc6d7c434a4a7abb22faba7c5657 SHA-1: e223a55be0ab93290cc6303f313b2006724d1f32 SHA-256: bba164788dee240d6ee633666522bea87badbf5c5fba505846d7be4df2b312fc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru' disguised as a comedy video. The PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xajibur.ru/123?utm_term=comedy+video++mp4+bestwap PDF link annotation
    • https://cdn.sqhk.co/seseniluvus/jdiihet/masha_eo_urso_brinquedos_toys_r_us.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/eFugcji/vagadijarodiwemalugali.pdfIn PDF document text
    • http://ashotik.space/thse_en_bretagne8plaj.pdfIn PDF document text
    • http://eushopvmn.site/kivedanyx1oa.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/DYifzjb/blank_december_2020_calendar_template.pdfIn PDF document text
    • http://usmileofficial.site/retro_video_games_brooklynjffr4.pdfIn PDF document text
    • http://fsbsiod.com/66002205959bma27.pdfIn PDF document text
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/b77d87.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/sitita.pdfIn PDF document text
    • http://instahelpforbusiness.com/50320675024dblur.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/9vjdihW/wanapefukodikaxovibid.pdfIn PDF document text
    • https://wugarusuxota.weebly.com/uploads/1/3/0/8/130814120/zaparoguj.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/dikuvinatekelawope.pdfIn PDF document text
    • http://rabota-plus.club/different_types_of_material_materialsr6tbb.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/fewoxedubekorex.pdfIn PDF document text
    • http://womenita.fun/sezodilinczy.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/5471581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_af9d95b18716471e9fa9a08b6195d6f3.pdf?index=trueIn PDF document text
    • http://dakawarinuku.epizy.com/bahara_full_hd_video_song.pdfIn PDF document text
    • http://zalerifi.rf.gd/22614052664.pdfIn PDF document text
    • http://jimotomalugeji.rf.gd/sunter_tower_fan_combo_costco.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_8e09aaf7b2bd4eebbedc6d3cc89b81af.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_f85ad770f42b4bb4b3e871f83b907d46.pdf?index=trueIn PDF document text
    • http://vewomani.rf.gd/magifidinezeku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 5364 bytes
SHA-256: d1eece45fe5cb9dad0e404dfa52327f23b876e8fa662111261acb6e912501049
font_01_sfnt_off00013ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC6 10768 bytes
SHA-256: 3a28d1f9a3d2948d0a3de11e78f480bb52d03266732d4143370469a09e9aaff4
font_02_sfnt_off0001637f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637F 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2