Malicious PDF — malware analysis report

Static analysis result for SHA-256 a281311987f61aa7…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 05:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a980cba42cc3ba3c6cb1fabd326ce99b SHA-1: 75ed9e25b7f997ede26b7a746630f0fce7f03d1d SHA-256: a281311987f61aa737e8abb03fc31f23432d95e56063d843e24a8189ece26377
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=video+overlay+app+android
    • http://www.itidharamshala.in/images/uploads/files/jetosurebepa.pdf
    • https://fotografski-studio.kost.si/userfiles/file/1787759581.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zukuzexavirowupipigexe.pdf
    • https://natinsel.com/imagenes/file/wapusisurosod.pdf
    • https://marathonroller.com/userfiles/files/27293990549.pdf
    • https://bitree.ru/ckfinder/userfiles/files/nuvonodulakagevurekeva.pdf
    • https://www.weboonline.com/ckfinder/userfiles/files/44185320337.pdf
    • http://chapelguild.com/images/usr/5926152298.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16134dac9af8c0---97143012923.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/daginofeka.pdf
    • https://technoarc.net/userfiles/file/97761712664.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/73142192257.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sasekojodufurudo.pdf
    • http://cmuniontravel.com/userfiles/files/66499575889.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/pesegakivanotedivosa.pdf
    • http://alcantara.cz/data/file/gurojuwu.pdf
    • http://joeun-it.com/userData/board/file/gofinurepugezebulora.pdf
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/28054314259.pdf
    • http://dae-young.kr/upload/fckeditor/file/kosizopumokexalalogife.pdf
    • http://archpiudue.com/userfiles/files/dadafowu.pdf
    • http://daisin1977.com/js/upload/files/lulosujiv.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5fe465fb---wasegalemu.pdf
    • http://cantinachitarra.it/userfiles/file/54724163265.pdf
    • https://olajpark.hu/files/files/dumoxigop.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc6ac6a362---lizupiwerobirukevagigefir.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://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_off0000b29c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 16792 bytes
font_01_sfnt_off0000cab3.bin
9863b2667ed29fcc0f008f22d0649c966cf5bf22c56b2b32660b6e18395080b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 10268 bytes
font_02_sfnt_off0000e1cf.bin
24ab0eeebeab4752e83e620e37307885902f4c748d03d5638f7053c49dba4620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 16928 bytes

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