Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ddbb8deb9220d7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 07:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df7cc81e55a26ab7d02053fd19ce103e SHA-1: b59765d743df12000849749f7b4086c89f70c5c2 SHA-256: 80ddbb8deb9220d7097a67c27d3f7b966863126d5a3ee263746b08ae7c1e7d6d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into believing they need a password to access an archive, which is a common tactic for delivering malware. The numerous embedded URLs, many pointing to PDF files on unknown domains, further support the phishing and malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://abogarestudio.com/userfiles/file/22228789838.pdf In PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910174637.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/nimutulupiwerolubebef.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/67821647319.pdfIn PDF document text
    • https://tigapilar.com/upload/files/36517797547.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/71925865871.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/81253137239.pdfIn PDF document text
    • http://getem.eu/files/file/xexadewujukurakezejufidur.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/48078731922.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/93534807642.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/silajaxidadibaletekira.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/feziwos.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a92a5f86e---vufisaz.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/bojurijurowutumadas.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/liboguxomumelemuwe.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/dujave.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/81903909546.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f53d9f21---lamig.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/walebosazapigotenobud.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/zibab.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/zivonudimanemukokot.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/xeruxamowonotavobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+remove+pin+lockPDF 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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 10384 bytes
SHA-256: 550d129b70ec3153ed56d0a171dd0b9012feed0d2200fb10826ec7f93095d877
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 18304 bytes
SHA-256: af03a1fd9816952a7eb6f8f3677c0793e83338156bb9de3040fd8af1c9340088