Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fac62c5220b06cc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 06:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77a0bf156c97af6926f2571f5af048bf SHA-1: 7f5b1627f5904d1356abd5aff644cd792ae2ec50 SHA-256: 6fac62c5220b06cc83d1159e4ccde98374970005404e2c8984e533550e457318
166 Risk Score

Malware Insights

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

The sample is a PDF document that uses a social engineering lure to trick users into installing a browser extension or update. This is a common tactic for credential theft or malware installation. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to malicious content, potentially exploiting browser vulnerabilities or delivering further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chikatere.com/Upload/files/79957105380.pdf In PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/niralibepuvuguvib.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/2351334507.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/xixan.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/kebor.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/galabawiwalugosumegixo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/71607149664.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/ravite.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae13ba063---kamabojenedazupatade.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/tinawokovojid.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kesazaga.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/98701976980.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/pasenudidit.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/70939607273.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/sevodivubo.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/nurowafogivilejelukubes.pdfIn PDF document text
    • http://htygroup.com/upload/files/biwasilulunekuzo.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/86737072163.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/vobevewezab.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/84038789123.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/19390029807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=theme+dark+chromePDF 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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 10184 bytes
SHA-256: c5edd99627a3a8b7ce87cdc962ca9385674f392ab27e81d2999c56c70e5b128d
font_02_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 17020 bytes
SHA-256: 87cf503ca720a9e0db6ae2602ad5c19a982a6335bfc6ed819455afd5ef7d16e0

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