Malicious PDF — malware analysis report

Static analysis result for SHA-256 261637833a594a9e…

MALICIOUS

PDF

82.1 KB Created: 2021-03-10 15:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: fa8706c829677eb2b1094d016b48ecfb SHA-1: 2e428fece85f2954d23b8dbf40fec103241c5f87 SHA-256: 261637833a594a9e5567284da0e901c56fd591b313f6c84149189a6d27a65186
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, https://mezovuduw.ru/strik, is associated with a lure promising weight loss information, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mezovuduw.ru/strik?utm_term=best+way+to+lose+weight+and+flatten+stomach PDF link annotation
    • http://sipipewawezizuf.getenjoyment.net/autumn_leaves_chord_melody_guitar.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/91359372053.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/rojovifotixoxixo.pdfIn PDF document text
    • http://hightrade.club/zaxojesakipatamubijijogi3d7ny.pdfIn PDF document text
    • http://sigiwisami.iblogger.org/jokapumatofivuxati.pdfIn PDF document text
    • https://cdn.sqhk.co/xepubijiko/cicxjbB/sirikizutegoxejesetofake.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/skoda_karoq_price_list_uk.pdfIn PDF document text
    • http://realwockyc.info/21084561882bfwp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fdd62be7d4ec.pdfIn PDF document text
    • http://agentsecure.space/wimpy_kid_movies_in_orderwct7r.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/jcQNQIb/bingo_live_75_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/rjgijdt/vipozadanibovenotuz.pdfIn PDF document text
    • http://bioforcecolumbia.site/bissell_powerforce_bagless_partsbeli2.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/flysky_i6_quadcopter_setup.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/hanging_bell_bird_feederc5nbh.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/Qhdo0MR/pikatexejok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fdad75c4c455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fda77258563a.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/hfGhfXB/watch_nfl_games_online_free_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_8156bbfbb39a4f2490ae7861dddc9fc5.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_9128400c479d4ad29673b9b2f1008da6.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_c0190f365e8f4bd69630be6b78fb7d17.pdf?index=trueIn PDF document text
    • http://vamagirizotaro.rf.gd/rajepebetak.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_16501e85f40b408f98b4cf86a4c9f9f8.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_693a954c423d4b79be6e49ac1d322d86.pdf?index=trueIn PDF document text
    • http://jimifodapamusos.rf.gd/novalegovibulin.pdfIn PDF document text
    • http://leligikolapib.epizy.com/barse_song_marathi.pdfIn PDF document text
    • http://damesudozur.epizy.com/whos_the_ugliest_boy_in_the_world.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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 5580 bytes
SHA-256: a9fefea0ead6a318342f8bc1ecd9fc24d81a3f794aab223b29a4d81043bb03e8
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 10612 bytes
SHA-256: 235045a629c8b26bbc107fa085bd487a113b574cc071e09660622a1a44bb564e