Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf20ce395f34a592…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 11:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f042377634079415e220ee8454a34f2 SHA-1: 613da7abbcaa6dd2e3b6557867a6698d6ebde279 SHA-256: cf20ce395f34a592668e2dd0711fe646b1fbfa75540ff5ad90dfe470c19d072f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and appear to function as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the nature of the embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=android+move+downloads+to+sd+card PDF link annotation
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/37162147431.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/kiwajolamonagibokotude.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613e554ce2b45.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/titazi.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/32064707903.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/4170571741.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/pitobunuwojemusid.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcfbda2ed8---dewibonadutivovofebejifo.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/51515276265.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kivupipeledorufasupoper.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/jusubixijibamer.pdfIn PDF document text
    • https://oasis-travel.ro/files/zabetatutowuloj.pdfIn PDF document text
    • https://scalper.ir/data/files/file/fubalipefupo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/90873027175.pdfIn PDF document text
    • http://dsraxys.com/uploads/vexipirezimaverome.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6bbfedcaac5cf012a65639bbfff48772/zijamedoxen.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/xamukitinuvoxanibutaw.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/19705900599.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/rawujesegogojitol.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/muravifupofakokero.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/jurenikozijifezebufevapud.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/bidubajunijewuv.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/riwipadutalerufuzek.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/17781073404.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://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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 10664 bytes
SHA-256: 919f1f664f4d226d551a6c83545cc32a2654959d0a82792fd032a57ee4ad4187
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16924 bytes
SHA-256: f10683a6c21cc3cf51ab88a8615fc006b1c746696e0f3e6af48174edbfa45fd3
font_02_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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