Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cfac97270bc784…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 11:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37493cc2a2f9dfbe7113e9f39db21ba6 SHA-1: 5ca99aa3baed30133a2c58cfcf18c156d9ddfdbc SHA-256: a7cfac97270bc7849a160827ab0ef9a119f3897675d0920b7fa2315abc3aacda
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection to malicious sites, such as the one found at 'https://crewmak.ru/uplcv?utm_term=emulador+play+station+1+android', which is a key indicator of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=emulador+play+station+1+android
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b2bc57297---79532466477.pdf
    • http://daoltrading.com/userData/board/file/88896302414.pdf
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/73037906214.pdf
    • http://stmarysharipad.com/userfiles/file/vorokurupowovuruziwope.pdf
    • http://sichera.eu/userfiles/files/87671104571.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/zefabosigobiw.pdf
    • http://bluekeydigital.com/images/pic/file/dimizegufumuxuwipopama.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f56821d42d---20395329695.pdf
    • http://goldmustang.com/files/files/pamekonewufedunisovi.pdf
    • http://dooroc.com/tk/upload/file/91356469265.pdf
    • http://hangtatmj.com/userfiles/21304738169.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/xokenitunelamitokonivubo.pdf
    • http://northcity.rs/slike/files/39155981738.pdf
    • http://www.dereformasenalicante.com/archivos/files/16613030719.pdf
    • http://spiregene.com/image/files/20210905_105351.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekopisaresufasafe.pdf
    • http://nigerseedindia.com/uploads/boxatuwowuzadixoxizativip.pdf
    • http://okmarin.ru/userfiles/file/lobagelugajunonekoselo.pdf
    • https://kebecelectrique.com/upload/editor/file/namitovalidaradozokatur.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140924b9d894---vaziremefigod.pdf
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wesizujonamavoratim.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/17754771667.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/86361059485.pdf
    • http://balaton.varosom.hu/userfiles/files/71560040138.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zokadi.pdf
    • http://juditphotography.com/picture/userfiles/file/nilevulegim.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_off0000f1a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
font_01_sfnt_off000109b7.bin
27a9eecc7604c5876f57b5e8a2810291b9210416491d8ebd86beec489bf8a51d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 10668 bytes
font_02_sfnt_off0001221e.bin
73c6a324e1d6054580e693d2a3ed804128c4696149e727463b07167860a10c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 19164 bytes

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