Malicious PDF — malware analysis report

Static analysis result for SHA-256 5598564f374f89d4…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 11:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 285dc79a185450ad5b008ad45aae17e0 SHA-1: 21f199d772ecb567b9956671f763130ecb1d4e5f SHA-256: 5598564f374f89d4c05d378a076405fe61ff5429b61435ee466c3710918d267a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=dua+for+sick+father PDF link annotation
    • http://dywin.com/uploadfile/files/34556270000.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cb4a1379---1135191909.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210921_26F772F14164BDED.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/42556473750.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/mafapiwixe.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zesaduwefa.pdfIn PDF document text
    • http://vhshf.de/File/petuxadazi.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/fowolexizagilidoduz.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/momenidefuvafigurusajag.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/riwiwobelefodororoxaxiza.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lirizefaso.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16609249191.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gapatozow.pdfIn PDF document text
    • http://hun777.hu/_user/file/gimagijaxa.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/repob.pdfIn PDF document text
    • http://atya.eu/files/file/84394257995.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/xogizijetizitaligova.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/23307131728.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/2580770590.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/ladukononekinodofizejo.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/16901989378.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/kibataxevetededab.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/tidorumutebo.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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 10476 bytes
SHA-256: 1c534a2cc2486fc27b1b61e1a7100584842385467d6b0f26a1155fea348b08bb
font_01_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 14424 bytes
SHA-256: c5e69137c945f9525efb77545899eb7ffc769998507f909f1b800f972a6333fb
font_02_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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