Malicious PDF — malware analysis report

Static analysis result for SHA-256 a693506a0b246318…

MALICIOUS

PDF

107.9 KB Created: 2021-09-19 00:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e22bf9067367b8f691a1cee7a25003ec SHA-1: 698c126e230852adfa212ce0a181755394bf6775 SHA-256: a693506a0b2463188edf861a4fb5f9036abe4a1afc1298e68a70aa5492315564
154 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 and appear to be part of a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=scaricare+gratis+android+market PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iv2qcno33rome6p5c6gm10q726/ropakewegimubekijuko.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jozojem.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/tetalaxorudejifegasopakod.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/42931011017.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/gijugovavewu.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/gezokemagafalexuzije.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/7643651002.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/2928892396.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614154c28f5c0---10281831579.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/tuguropikenevovonitoweji.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/55612578626.pdfIn PDF document text
    • http://symbolfoods.com/files/file///82166815116.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901111732157797.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mebuvulenivokuwoxok.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/53297350706.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/nidurupokugositono.pdfIn PDF document text
    • http://strahyi.ru/images/file/sovefazigone.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d5a0e824f---jojofubipopafaroxupufowo.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/278535358.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/jisok.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/vosedu.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/19489750720.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/towerosositogitegurizesad.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_off00014156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 10836 bytes
SHA-256: e225c1b36eaf1968b33351a3a51f1aa8bc83712c97a1ac13b9e01af70ebff42c
font_01_sfnt_off00015a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1D 18744 bytes
SHA-256: 7df61b97a5ebb986ea83af9cc01ac8eefd35bc4edccf43d48867072e7e2f241d
font_02_sfnt_off000189c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1