Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea90f2c93f73cc2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 08:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddcd398cce6c8464116dd0c1cdb81c79 SHA-1: f959862e5b409c5de1fe89b3455277791c741471 SHA-256: 5ea90f2c93f73cc2ebb98c8ff3cd51c5828ef5d32cfcb4f2a9b13bba8bb51107
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kientrucsangtrong.com/plus/files/4455526551.pdf In PDF document text
    • https://tortugafilms.ca/adminfiles/file/89745472743.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/793a6nhu0anupr29qa24dlb8j4/71497567339.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e116871d7---25569028809.pdfIn PDF document text
    • http://jonellchem.com/upload/files/74223045283.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/tunivikirage.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/95934893531.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/nalasuwisexilotev.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zusokitenojamu.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/lapakiwuvotodaferaluna.pdfIn PDF document text
    • http://ippon.lv/uploads/File/5853997833.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/17801093651.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pejanomupav.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/60484582916.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/bagafukezogodagegokor.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/41935604955.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/jikoboj.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/sovokamomuloguremoxuwiw.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/jiwogurowepepaw.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/33983255205.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rugabeliduxupolunolazupe.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/36701448261.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/vuzunimebadomafajorit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=monopoly+apk+onlinePDF 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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 17652 bytes
SHA-256: df1598706ef944e8f1ed29f8e5dfe63b28ad0fd58cc8c437f5d56be89b76f5e2
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 10080 bytes
SHA-256: 747ab80f84b1c8a866bd7854c28b7f1d2827418745d22c63106171361bd6d176
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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