Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b66ca9f7536d7f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-30 11:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8327dae5c7121df259f59ba8d12b3022 SHA-1: dac5c4b8918d3bc1366ada2f6361fdb258af225f SHA-256: c1b66ca9f7536d7fc35ff6f594509aee57d3b26f7df99cd3a597a5a2eaed8398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://cancercareresearch.com/userfiles/file/50993974997.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/59856638707.pdfIn PDF document text
    • http://berbun.com/user_img/file/46190090449.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nodijemefobine.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/vuvineroputanuromanebuxu.pdfIn PDF document text
    • http://medrea.ru/upload/files/36919758848.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/vavudefi.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/fabise.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xomisugoxomexejepulod.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/fezudatutis.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109120632526964.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/68398360365.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360065ce21d---94687183887.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/kodabibuni.pdfIn PDF document text
    • http://www.depomatrial.com/file/71397793862.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/9770875768.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/zuxidoravas.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/53301700479.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/wenefepidajitelebojo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bc47ac46229a753da089513f903f3424/datuwu.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/17895419057.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/28401123735.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/lunibevomegetukad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=onsong+android+alternativePDF 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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 18740 bytes
SHA-256: 688dc106aef474bcf9eae7447115306d96b90faa3f0877bf4c461895b9016844
font_01_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 10512 bytes
SHA-256: bea21d8f0015a7cbd1c0f7533ccd935168ca768387387401a256c47c9a10c76f
font_02_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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