Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0bf4627f233b75…

MALICIOUS

PDF

76.4 KB Created: 2021-10-06 03:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bac7a8bd3ab1cd25404a20e192eec004 SHA-1: e4ff880dd14bb5aaae5e627b969e5803a89b80b8 SHA-256: 7a0bf4627f233b7565f7503f177480fb602ca4614b026e53cd6a52523852efb0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=in+the+house+2012+full+movie+watch+online
    • http://www.farmaciapenil.es/userfiles/files/90286085832.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/sijipitulobanevuf.pdf
    • https://tanthueviet.vn/img_data/files/72829585722.pdf
    • http://hoogbegaafdennu.nl/userfiles/file/penalakinoxugoposopi.pdf
    • http://mfcpavpos.ru/file/17953045104.pdf
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/83703044750.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/janawomafamepetan.pdf
    • http://arunimaflavours.com/userfiles/file/pijisopazomiwosovurixido.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/kugefotilejededobezabimek.pdf
    • https://tepatsasaran.com/contents/files/zesuru.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/74140061663.pdf
    • https://monyetjoget.com/contents/files/kusujisafadovuwara.pdf
    • http://a1climbing.com/userfiles/files/12398422578.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16146d4f8511aa---83312136134.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/bawupu.pdf
    • https://ww150002.linebot.net/upfile/files/20211005184721.pdf
    • http://peoplefineart.com/assets/202109/files/20210919140754904894.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/91678201411.pdf
    • https://kalimati.in/userfiles/file/nagavifuxixiludazokuzefov.pdf
    • http://happinessgown.com/upload/users/files/mamuloginunewagetepavalas.pdf
    • http://mobydick-band.de/fckdata/file/basujuz.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/38620727994.pdf
    • https://sakesushimn.com/userfiles/files/ruwufowi.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/rupoloriza.pdf
    • http://minhledtran.com/luutru/files/fatevinugogu.pdf
    • https://arbormaster.us/uploads/files/vekanozezimawotelos.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/mevejowekanogif.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_off0000bce2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 16792 bytes
font_01_sfnt_off0000d4f4.bin
8794303282a19e64fc0d53c53ba743d1a4072a6872e16d80f6f90f5b5a721f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 20656 bytes
font_02_sfnt_off000109ab.bin
70a830016610a044205371a61354e83e11099688ff7b290a74a5e9fe28af4212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 10996 bytes

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