Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe28c97d009fbff…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 18:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 918355e717482605523c6f99042e38ac SHA-1: bd4c734d55f72fd13ae374f1660f3567d0c81ef6 SHA-256: ffe28c97d009fbfffb846774e50e103e9ae3daeca5c990276ce63ee1d2bfc629
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous URLs and is flagged by ML classifiers and ClamAV as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering to trick the user into installing a malicious browser extension or update. The embedded URLs likely serve as download locations for malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=unprotect+pdf+file+online+free PDF link annotation
    • http://chelseafoodmart.com/uploads/files/39301685430.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/dopexumasorukemevi.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/31325836358.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/gadirodaputonujuv.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/4412973709.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49c1a67ac---vanalowidironijo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/68580926900.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/9688652807.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/venumudepixotoxuxogemi.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210911141939.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/62907260184.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/77901660732.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/lamovedakulepimefuv.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/57526081606.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090212055773499.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/96492802174.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210915223536.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/xizuru.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/76212250064.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7af08736ef262d309dd9d5cd01a5280f/31747353519.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/24657165567.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/xevenawida.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/10336111930.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/88172792278.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/46056659995.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/37927782100.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/57722904492.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17020 bytes
SHA-256: 01e690493c3ac4f3350096b96b3fd103721fdd496375b261674a986e3c3fa962
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 10292 bytes
SHA-256: 5d1890c0c5d4f8dd53dc50b2098e66d664f594463d3442ad3415180540e02dc6