Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2a7ca36d8212bf…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 06:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5374d79e367a017d0c7a760adb20f192 SHA-1: 61fa41e4e9013834978d71b2f1a477eb3753f83d SHA-256: ba2a7ca36d8212bfd5933f7de6069ebac608fab41e574428b54acdb05282c859
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document's structure as a link farm on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=sites+to+download+animes PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1865f53b---mijedasij.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/7897970362.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/penunifumawezit.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/rufelodegimu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/virabiraponogadakos.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/42621844526.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/wodajufatunumosuremedudi.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/61151348070.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/62424078194.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kijodizobop.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210920_2BC07548ECE40A78.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tobatokovejefu.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/50287222396.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61381273cd56a.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/98632610443.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/55827084384.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/lefumaviwivezibef.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/ruworixukajomikusupilodu.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/88833286311.pdfIn PDF document text
    • https://synersys.fr/contenu/file/79851628830.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/lolebutugijezokobilo.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/1430253569.pdfIn PDF document text
    • http://rem-proekt.com/f/file/73396352879.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/futupuwitenaravefudunori.pdfIn PDF document text
    • http://fteq.ru/files/file/37380348900.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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 16488 bytes
SHA-256: b1edfc27ff8d6bb6c367519b9b46baff658a95cc02c8f68f4699e4e75d9a52bb
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 10472 bytes
SHA-256: bf200a265567e5879c761576834522cce88d4f20258048f4a2ff95e92143a1e4
font_02_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1