Malicious PDF — malware analysis report

Static analysis result for SHA-256 a913427a4fdd5305…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 07:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ea5ed7bef0af4c2b40f46debf24004e SHA-1: c2f593faabe7ebd762764d432edd8465df83b2d4 SHA-256: a913427a4fdd5305e79ca591f73406b4f51762b6f602eb444fae3835f31f109e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a796e8686a9928318056998ca83579e9/wodokalovinezi.pdf In PDF document text
    • http://resheto.ru/users_images/fck/file/difolonajuj.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/gevulenumefufegup.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/subikew.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/winekutiguzi.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/laregivibeviga.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/43573532273.pdfIn PDF document text
    • http://rotang.net/userfiles/file/nonazubitofalupo.pdfIn PDF document text
    • https://tekmaker.com/upload/files/56603363202.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/resafanax.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/naxugaza.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/06/dibuwakizexitowofulemo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/tatudos.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/78131489348.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210901141218_797mnz.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/39928252686.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/najimaje.pdfIn PDF document text
    • https://filetorme.com/upload/files/50891089066.pdfIn PDF document text
    • http://termocity.by/pics/files/dejipisedusijodesemus.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613956b15da23---vazolud.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/7742760478.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/1782672212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+voice+training+app+androidPDF 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_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 17440 bytes
SHA-256: 95d62a5366182a8c522c03c20dc15d4c44c01cdfd1a2326d8f8200b6242ba21b
font_01_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 10764 bytes
SHA-256: ff72f6c7c5ae2d8218020ad8047eadae1a5e2d490b704fe43274f86656846fab
font_02_sfnt_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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