Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c578a9229a9c49d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-22 23:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79b459574935244be677afe44789dff5 SHA-1: eab92950a712282381ae78ef05f4d84360c2b893 SHA-256: 2c578a9229a9c49d1d9bf54058f57e1fd008728a3d7d48ac2bfc15cf49a27c80
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, contains text related to 'wd passport' and 'backing up', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=how+to+tell+if+wd+passport+is+backing+up
    • http://fumexijana.getenjoyment.net/les_caprices_de_marianne_de_musset.pdf
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fe88275ec7d2.pdf
    • http://tafakiduwav.scienceontheweb.net/rilusobavelisuvuw.pdf
    • https://dudixojazimonam.weebly.com/uploads/1/3/4/6/134638097/jizaluj_wufofemaxani_xujax_xagofek.pdf
    • https://cdn-cms.f-static.net/uploads/4485450/normal_60475d09a3818.pdf
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5feb48312b433.pdf
    • http://nufivuzelikonax.getenjoyment.net/savuluxejujewowi.pdf
    • http://fopokigife.mywebcommunity.org/carte_du_monde_capitale.pdf
    • http://jugapus.sportsontheweb.net/71379623455.pdf
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/6237837.pdf
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5fde11768167b.pdf
    • http://bidizujimon.getenjoyment.net/what_do_you_need_to_fix_a_blown_head_gasket.pdf
    • http://pofuxubilet.sportsontheweb.net/la_casa_de_bernarda_alba_abriendo_puertas.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_600e23ca834d6.pdf
    • https://jojapunopumaj.weebly.com/uploads/1/3/1/4/131482926/vilukadoreva-zateboxurokas.pdf
    • http://giwapozolaleg.mypressonline.com/sunomojowefabep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://magegefopo.atwebpages.com/how_to_reset_intertherm_furnace.pdf
    • https://uploads.strikinglycdn.com/files/d1f3b588-8950-40e8-87f4-ff76fe035629/elements_of_design_shape_photography.pdf
    • http://rosajeku.myartsonline.com/defigatabibuvadogex.pdf
    • https://uploads.strikinglycdn.com/files/9e99c414-b808-458f-9a43-a0347dd200d6/homelite_330_chainsaw_carburetor_adjustment.pdf
    • https://uploads.strikinglycdn.com/files/27a5160d-fa35-435a-98e4-78336d1dbeab/taposumamavimavudiguzu.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_off0000f08f.bin
6b8f6350162751c75e5a75bbd3d0a44d91433eeea9b899bd55cb843c507f0554		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5580 bytes
font_01_sfnt_off000103a8.bin
8d10561ab3a50278145d150c7218f1d496f56c0f5cc16e3b60ac889072891ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10716 bytes

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