Malicious PDF — malware analysis report

Static analysis result for SHA-256 c180cdac4a16dcf2…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 01:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b90a6ea532eb0b61afcaed3ad0552454 SHA-1: 84b40c4f604228753349485473e087a15784f182 SHA-256: c180cdac4a16dcf2881b26d0ee34e770401ed715838ac9b6841be4a499fb6af4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=android+backup+file+extension PDF link annotation
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/tiperogofadi.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zilipepegogefenexul.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/36928538532.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/jigelosap.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/26433072260.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/sawofowiranegezigi.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/90978806425.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/12673978927.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/73952517894.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/47916573450.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109241210444074.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/86229655072.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e25a6e9a25d2f1806408d7f0300d62c1/65057143112.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/39849910984.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/lixivakinavakufipo.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/41263738763.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/31921350561.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pepulitupalubaliwaxod.pdfIn PDF document text
    • http://fygl.net/uploads/file/241008397649.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/ladebosalefa.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/kowunaseduveguveronunufen.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/12348487732.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/dinuxosibulutarawerabarun.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/vemepuzajokivujanufepubem.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614824e35df61---mupegefaxe.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/dodigogimigad.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_off0000b180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 11028 bytes
SHA-256: dfe2f43f3d8de837122e10559e2ab2daeb5bf62ca31bbac8afda4312f2882e61
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 14552 bytes
SHA-256: 516d3a8037d3065acb32d0b365ebf43377719f79beba1f55a2f3bf7476b5ac20
font_02_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1