Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3782b6d83121f6d…

MALICIOUS

PDF

74.1 KB Created: 2021-04-11 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba7b64587039fce314daac7fb86a366 SHA-1: 21e06cdb9ffb12f155b67aa3eff79c89791aa98b SHA-256: d3782b6d83121f6db5fe4291e1666a540684b8d18aa4a0112f34b064153e8ff3
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, https://xezojetit.ru/strik, is flagged as malicious and likely serves as a lure for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+heavy+is+a+big+round+bale+of+hay
    • https://cdn.sqhk.co/ronelejibir/Wh4icK8/bike_stunt_games_2019_impossible_tracks_new.pdf
    • https://cdn.sqhk.co/sezogitov/Puieshh/fofumutexuge.pdf
    • http://korefubelexusiz.medianewsonline.com/70404910096.pdf
    • http://rarebuzoxexovom.22web.org/lazapixona.pdf
    • http://zifeladawu.scienceontheweb.net/la_peste_albert_camus_francais.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_2ff9742fccfd476a8ec988850a24f255.pdf?index=true
    • http://xuxerutiwuv.onlinewebshop.net/leather_carry_on_luggage_with_wheels.pdf
    • http://gedobesixo.epizy.com/how_much_weight_can_you_lose_on_a_one_day_juice_cleanse.pdf
    • http://zerason.rf.gd/50640735946.pdf
    • https://uploads.strikinglycdn.com/files/fdd2bf9a-1372-4cc9-9329-99e3364b4bcd/top_500_songs_of_all_time_2019.pdf
    • http://wosamufudov.epizy.com/proceso_de_socializacion_psicologia.pdf
    • https://uploads.strikinglycdn.com/files/84f1c6ba-687f-464a-aa5c-e2c33ac1fc4b/bofejiv.pdf
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_2d94d9e756fe4d48acc8e8d07cbeeed8.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_b2af882ae8134a04aa262c5cabf4fa22.pdf?index=true
    • http://desovizipelo.onlinewebshop.net/68628808119.pdf
    • http://nurejorafu.epizy.com/sourceforge_creator.pdf
    • https://uploads.strikinglycdn.com/files/21bccf62-928b-4e16-8f97-6f1f739c3333/iso_9001_training_manual.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_off0000e347.bin
1b47a5985057d71bdf31680305a29373d03f02421af9a1515484407ae6573ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 5524 bytes
font_01_sfnt_off0000f625.bin
4912237ecdea9320e88b44b0886ab3483dbc77de94415df6e8af3b60d251a03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 10892 bytes

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