Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb4484e1a13e62f…

MALICIOUS

PDF

91.7 KB Created: 2021-09-20 13:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80264fb6f644b0707093242584905962 SHA-1: 88d24e8f60d9741d9ad6f1cb7ad480c74ceb457b SHA-256: abb4484e1a13e62f1f65628cb4d980dd5801d17e21ff880e256798978726afd8
66 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many of which point to domains associated with link farms and disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://laborke.ru/uplcv?utm_term=malachi+bible+study+pdf PDF link annotation
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/dabepozijegakudukidol.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/jelalivosuvegedewetikepa.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/puzepalalisuvepexidixel.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b85b060f---57924804056.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210914020457.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/9569489793.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kemedifuwojejobanev.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/1487379078.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/bakojisadigegodava.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///golanimoziki.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/69529832173.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/nodumolavapag.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/tixololifipunituxaxekugo.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210920_1CFE917075B34310.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/ziroro.pdfIn PDF document text
    • http://vanhacollection.com/images/files/balafazebeledudoge.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/37212906836.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a01f19d59---milenarovofez.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/vogopuwajiwi.pdfIn PDF document text
    • https://reha.bg/content/upload/file/98144284777.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/41958471126.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tojakozofori.pdfIn PDF document text
    • http://www.polni.si/Images/files/32851604775.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/10737608838.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_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 17792 bytes
SHA-256: 17d81857447adaab2784204feccb72eeebe7032f53d0f515f1fa9a135fc212d3
font_01_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BD 10740 bytes
SHA-256: 56a52d8bd0a1a94e5722898592f12dffa17ce42fad55bc732808c60fc6e6a5f7

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