Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32858c6199889c0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 23:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4eb901ad6afe23bf59d523ba7c1c3e5 SHA-1: 7bb4da1af8f81a22c8eea43d02761d84d16d98bc SHA-256: d32858c6199889c0839e9df4db8826e528de1b8919ec6cf261ddf3a26620fa99
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection scheme. The presence of a 'Password-protected archive lure' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=free+android+appz PDF link annotation
    • http://imreelectric.sk/uploads/file/bujakuvipetosa.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/sirufakurusozan.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/gibibavamosalolen.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/5399540146.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/neganexozunotemubusag.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/47079481721.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zetegebawexajozusafew.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614867346f5d6---76445115043.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/37443524153.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/numixarefakasaze.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/93197248602.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/lusine.pdfIn PDF document text
    • https://gencatakan.com/upload/file/dimosoneratajamikeb.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/dakevonuwerogev.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/relopo.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/34894389408.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/bemomaruzegirutaravok.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/39382593143.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161451b5c13502---kalanajabi.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mevonopiwibida.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/pokiwopudiv.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/49264307234.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/vimegefora.pdfIn PDF document text
    • https://maisonforville.be/documents/file/doxebolimemek.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/63897714977.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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 17496 bytes
SHA-256: 390d44e45c0cce6c209d4eeb33b13c757eca124f1ee2c003be8f5929462ae425
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 10112 bytes
SHA-256: dc50d99baea08d75753ff9f363881222b663e92e2ad2e17aaabe753f0dd8c2ce