Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15dbcd083f36b54…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 02:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d32019846860961867f5d526e6d8099b SHA-1: 1846a73c303b4e04113726e6269533ab59b82857 SHA-256: c15dbcd083f36b5430442a5b07ad5178670b08b62ca644b1521d2ad2d242e86f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only design with a click-outward action, typical for directing users to external URLs. Multiple external URIs were extracted, suggesting a link farm or redirection mechanism to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=the+art+of+logic+eugenia+cheng+pdf PDF link annotation
    • http://zulassungsdienst4you.de/bilder/file/52909400350.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/47957415132.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p7brkdse2aaotb81dqfsjnjetf/68152690380.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091610484964.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/24982541252.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/komipitutenazufowuzanuba.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/ketosimikubem.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/senobuwomikedilib.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/60b22392243b70456c65af0246d5e757/37052139387.pdfIn PDF document text
    • http://trevorhannant.com/gigolozupotifoj.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/78227724936.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/42552081560.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/taniketejimuwomipazuj.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/88646501383.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/nixexufo.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/14174193192.pdfIn PDF document text
    • http://standdominica.org/files/files/filugupumovevovi.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/jasareseduvovuxabazonup.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/40885555458.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/99470222804.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/9525267362.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/lovitaxirisetexu.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/54824725383.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-8/20210908025046911285.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_off0000b0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A1 10796 bytes
SHA-256: a350a1ce7ef9c219ad5d493a040fe3158c7c149a8f9658eeef08a095774c82af
font_01_sfnt_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 14104 bytes
SHA-256: 1a52d497a6c3c536cf1fdf3f20f2c3973e2b1509e41f325188cb90990807a337