Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0fdd615194c39f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 03:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e348a4a2b800e6bd5ca28024882c8b39 SHA-1: 52f7cc94c1371a5205db8912b0b19cc05df493e4 SHA-256: 4b0fdd615194c39f30b79191b8b023f065f00f8e966ed2e8bed641a42bc3fa77
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded links, many pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through a large number of low-reputation links. While no scripts were directly extracted, the structure and link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://sola-brothers.com/userfiles/file/banewi.pdf In PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/lunemafimelafazifedebam.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132603d8eb53---soleminazimodosajiga.pdfIn PDF document text
    • http://ge-mak.com/files/1254715671.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/53398902148.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/balefisupamuzifivitososop.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/nikabuwot.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/23863552319.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/89736154940.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/80970991123.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/pagezirenu.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/pegukuwivinos.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/91520837139.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/verokuworurasaxuwa.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/tekisexesotesomulilad.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/gogoxe.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/51931926288.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/zajarun.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pudigew.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210915_AAC19544A2AC3F85.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/pevezepotapekonekafudok.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/gifaxogebazuwurafo.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/63883959745.pdfIn PDF document text
    • http://w-mill.jp/images/file/sogotiferoruwitaromami.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/1667035882.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/tupubesaxukolukoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+z+ps1+romPDF 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_off0000b6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 15680 bytes
SHA-256: c14cddc0215e7977245a68077a99b5b48da6995d2e6e2f0c7d53484494ca2ac1
font_01_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 10524 bytes
SHA-256: 495c9da63f720f149b3ae42076f25137a41ec7400fca5ecd00725046306cd513

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