Malicious PDF — malware analysis report

Static analysis result for SHA-256 326bab37ff45a724…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 12:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 472b79059349451119e1eabf186a268f SHA-1: 7817a51dd761e8035a587844ec9ed16ab4339a47 SHA-256: 326bab37ff45a724ae27c0dcc61bb8733a5ee1fd212c68e378ccfd480774901c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, with a high concentration of links on disposable hosting, indicating a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. The primary goal appears to be directing users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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 http://euro-ex.com/images/blog/file/19738234395.pdf
    • https://marblo.ph/app/webroot/img/files/zumegutituponugojaxoni.pdf
    • https://shevtsov-art.com/uploads/files/dajodafusuxegu.pdf
    • http://ecohort.com/userfiles/files/butaj.pdf
    • http://www.fonfe.com/uploads/files/kunimixo.pdf
    • https://nezrenweb.com/calisma2/files/uploads/77908180921.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/71880255212.pdf
    • https://fa-vietnam.com/webroot/img/files/69880070625.pdf
    • http://cementfeet.com/userfiles/file/bujexuluv.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161385fa553d62---58961277591.pdf
    • http://gildiamasterov.ru/userfiles/file/bijojivu.pdf
    • http://remont-m.com/userfiles/file/netatizofanopupemusegir.pdf
    • http://inannamsao.com/uploads/files/fabodupabawusiv.pdf
    • http://mabifitness.it/userfiles/files/33081534417.pdf
    • http://insightonafrica.in/userfiles/file/35642690868.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/lojebu.pdf
    • http://humidorio.de/ckfinder/userfiles/files/nuwabujomivilulabupesij.pdf
    • http://24cvety.ru/upload/files/zujozifaw.pdf
    • http://balie.overeembv-profielen.nl/upload/files/sinazonogon.pdf
    • http://hndgyl.com/v15/Upload/file/2021991928298319.pdf
    • https://trinityautorepairs.com/uploads/files/pokogukegirasuxanikukesix.pdf
    • http://istvietnam.com/rich_editor/file/xususuxuluxoxagarad.pdf
    • https://lecourbe.dk/userfiles/file/rabibuzati.pdf
    • http://kondicionery-elektrostal.ru/upload_picture/file/devurok.pdf
    • http://abwmountvernon.com/uploads/files/womaputozawazavogirufe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=my+name+ringtone+with+background+music
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e975.bin
6aeb4225757f38e409c29243c6658d102c48cf19756937b89a7a5a81d176eed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 11296 bytes
font_01_sfnt_off000103aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16792 bytes
font_02_sfnt_off00011bbc.bin
6fd328d896bd73e25623ab56b5e2d8c12cd1ef5ea3b51762be64a5fa043c10eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 18608 bytes

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