Malicious PDF — malware analysis report

Static analysis result for SHA-256 793efff5edfe2286…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 14:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f96db9aed25c5c42f0811e262edb6bc7 SHA-1: ad0b9be5dfca24bc64a2de36d27a3660292af323 SHA-256: 793efff5edfe22868178306209f7860488f65621df6081534025cf7b57457fc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bunyaminerdemir.com/resimler/files/14494812448.pdf In PDF document text
    • http://willajarmar.pl/userfiles/file/feramagerapiwosek.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/nabelanadezibumux.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/pegegenodifutijakalumabom.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161406195d7dec---91147062083.pdfIn PDF document text
    • http://4yoga.by/pics/files/gosulakawopajuxuguwilom.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/fekalisas.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/44898881583.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/45438904727.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/34926721547.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/tavopi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/41162276694.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/tefadaluzalugebos.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/3862645891.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/nulatuvinoxuridubegosejo.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/78742953861.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/fanukifaronuzoxokigafor.pdfIn PDF document text
    • http://www.f2dassociates.com/userfiles/file/telujijelukofolegufuwebax.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/62292298970.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tivudugolotozebadomi.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/joxonixewidikon.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/79073867404.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/felepewe.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/38954374700.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/kilelijurudimaxuvufabol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=apa+7th+guidelinesPDF 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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 17616 bytes
SHA-256: 2eabc2536631a95d18c51c28bed5d4a86c74f1abccc4c555d16d26710b5a0170
font_01_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 10584 bytes
SHA-256: 837a45faefd0b0f0ed9b655740fb49a6b2eb47cb714ff15929c6eeaab293e6fd
font_02_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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