Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b5af9955387260…

MALICIOUS

PDF

74.4 KB Created: 2021-09-15 15:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cb51a727af42e4c3fd0da5e655889da SHA-1: e884ed1b546f34f091cf61f1de7de89e7cd61395 SHA-256: 42b5af9955387260b2d3deebeb4d9da9bcfbc11c6809a827072987d33985727e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=miui+12+redmi+note+8+pro+super+wallpaper PDF link annotation
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/maluk.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/70735624190.pdfIn PDF document text
    • https://digireg.se/upload/39642652187.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/wiwutagolidag.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/56023647668.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/51330619488.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/winukapinozoxozaxasuru.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/basis.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/46805059261.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/wisadevuvu.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/pivimetadixoposumipawison.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/31071970864.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vomagexame.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/tepitilowiluvapowodamade.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/pivalaxuwefude.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/55166746751.pdfIn PDF document text
    • http://domainecomps.com/documents/files/70824505954.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/83579840429.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/47732965003.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/79163019407.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/pebitasefibedorewipovavu.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/zupusedipefamogegipeg.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82308764367.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_off0000be19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE19 11112 bytes
SHA-256: b9601dfecb2c13f4e7fb10a8002332a6bbb51cc2215bd7d510189e82044d61c2
font_01_sfnt_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 17076 bytes
SHA-256: 42c028eebe3bd16221504e236a945731d7a0ee628de193f44ba9e1b0b68d0eb0
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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