Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab99e2fa0c9d3829…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 03:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 696c07832bc6b66969c3fa01a43c97e9 SHA-1: 226df35adac8de9e81caeab862fa67aa8d8d612a SHA-256: ab99e2fa0c9d3829fbeff1128db6c3e14d5b0ab639dffee2bb112ef13aebe561
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious, and heuristics indicate it functions as a link farm. It contains numerous embedded URLs, many of which point to disposable domains or redirectors, suggesting an attempt to direct users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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://kalashad.com/userfiles/file/80588452713.pdf In PDF document text
    • http://sunmoon-glory.com/web/upload/files/nisaxelixodetovawita.pdfIn PDF document text
    • https://invision.buzyhub.com/files/4854954926.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/98218879201.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210904223021.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/rorunogukorujemomoveku.pdfIn PDF document text
    • https://synersys.fr/contenu/file/78320513931.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/wojitagozagomut.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/34240605153.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/lufurun.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/jasefelagujukujawa.pdfIn PDF document text
    • https://lesura.net/userfiles/file/potebunozoviwix.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210901223617.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/mimuzawobesek.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/77622409089.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14c468d9b---95366860160.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/38874100944.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/28906810043.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/44882380083.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/63972469755.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/wegosujilavadokaxetiniji.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d455a8f86---40376207711.pdfIn PDF document text
    • http://teraval.cz/res/file/20474730532.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/4038313009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=800+words+season+3+episode+9PDF link annotation
    • 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_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 10900 bytes
SHA-256: 6f8accb37bb25def5274a6e4fa0bd153a29388ef2779b753fbc1b1dce94856c2
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16420 bytes
SHA-256: ec287dc64ef9e371596401f86e31da781c774e1a435d32cf72cd5ce1958672ea
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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