Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e55607d4a4366b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 21:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef519cbe194aa339ea2b04004ec138b6 SHA-1: 9162ddb630b423aaa11e2521406f55b6df1fd20c SHA-256: 36e55607d4a4366b3e0afaa5dc2524ff7971b2c8429a4822affccc0d61391fd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=dragon+ball+z+kakarot+android+gameplay PDF link annotation
    • http://turnwealthy.com/ckfinder/userfiles/files/mosujunajave.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/42523107358.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/bilanoxuvu.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/41786150857.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/62919081765.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c8acae0d---kifitapivibe.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85952265575.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/18957336536.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinoloritaw.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/84321603931.pdfIn PDF document text
    • http://aminotp.com/upload/files/98001025714.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/fokuvofobazokele.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/7540547292.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jikelezefewis.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/15339818588.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/xojepizilu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///waroxowukilojaka.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/mavufub.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/jafejozesu.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/90183673965.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/29067333180.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/4017351019.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090205302834.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/vasenuvaji.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613646023a6d5---niwigubipovixuropinebab.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 18076 bytes
SHA-256: f8ac77ff3a168a4c2fb5e1542142856d779a200fd630f85d06a95dd51bc42ddb
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 10972 bytes
SHA-256: bad121666a4d70a1327e2c25b93ac6ef7f8f4edffcfa6707aaf5f6b736fe767a