Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb51d0a8d2634eda…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 15:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e234078544170bf760c56224b15ca90 SHA-1: 3e6c770652241b230f29f6e88306aac208dffe70 SHA-256: bb51d0a8d2634edab9bddebac42efabde7ea3a5413e12a573e09376119c59c77
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to suspicious or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://stomatoloska-ordinacija-rijeka.com/files/fozibi.pdf
    • http://shannonlakeestates.org/fck_images/file/39218947740.pdf
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/xidawovakafowi.pdf
    • http://studiocinti.eu/userfiles/files/56349879547.pdf
    • https://comptables-publics.fr/userfiles/file/roruwezuzamod.pdf
    • http://gzcil.com/uploadfile/files/gogusezapavilunosijowi.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/lezanajal.pdf
    • https://shaksheer.com/app/webroot/upload/files/basuj.pdf
    • https://barcelonacentromedico.es/files/galeria/files/gazenitanigike.pdf
    • http://nenorm.com/files/files/89462409231.pdf
    • http://fnathservices.com/upload/file/femosimuvulifarerudojupe.pdf
    • http://erpos.sk/data/files/juzis.pdf
    • https://wineart.online/userfiles/file/49607572680.pdf
    • http://fueandhair.com/userfiles/files/zinobefejumeroxusikefe.pdf
    • http://vit-physio.de/file/37423472225.pdf
    • http://tpdw.pl/userfiles/file/pinigumalixe.pdf
    • http://sistersaviopublicschool.com/userfiles/file/bivibexexuxenesetew.pdf
    • https://santa.sg/images/users/00000000/files/gobod.pdf
    • http://castrolmintabolt.hu/images/upload/file/94073094115.pdf
    • http://www.itidharamshala.in/images/uploads/files/bugex.pdf
    • http://osc-pribor.ru/products_pictures/file/73394129499.pdf
    • http://studiopedrazzini.eu/userfiles/files/2776170463.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c2c906929---zovomozetipoxujo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=flash+share+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 16792 bytes
font_01_sfnt_off0000c7a0.bin
1b820d7b4ef4b5ce467e84f6ee7da5e26e4384be9922689952ca530965fb0f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 10452 bytes
font_02_sfnt_off0000df51.bin
577f4bad5638739d4d6bef48d692a97b2905fda742e1385f30d7d27954ca1bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 17196 bytes

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