Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb1c5dd2d07f5e3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 14:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d5852b69ea27ee54bf6e1412769eacb SHA-1: 9ef4ccf9aa0e238f4a082008659d8e25988ac94f SHA-256: bdb1c5dd2d07f5e38d55323ccf1770c771e55dad9bb62df70dfd60132196ff3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links to external PDF files hosted on various domains, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7832

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://taiwan-tsai.com/upload/files/bijamuripesazuxez.pdf In PDF document text
    • http://eprdel.cz/userfiles/file/gidekidegavuxipagofox.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/torejuxerutirukigeta.pdfIn PDF document text
    • https://tdfstore.it/file/vurodelal.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/fokasebaf.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/xagolexa.pdfIn PDF document text
    • http://forti.in/userfiles/file/megutijolesu.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/wasajeruxumuvuvim.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/61498950927.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45004127751.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/25401694960.pdfIn PDF document text
    • http://cloverdiamond.com/file/67386150634.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nunexijil.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161301ca5d2aa4---nezesiwosekubuze.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///54285397013.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/42567657630.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/nupazutatepaxunezeti.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/papimafawovid.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/42593654162.pdfIn PDF document text
    • http://csp.hu/editor_up/sepelelopitopijasubos.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/67763988182.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/jetolodexugozisu.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/7657007218.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/zodiregesofusojoji.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/vokuxaxulunusuvemajujuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=glencoe+mathematics+geometry+pdfPDF link annotation
    • 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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 19476 bytes
SHA-256: 0dd8d34ef4e32e1aab4ae2b6e83ead3a06c61d3efa0c3709526b3e580391ae45
font_01_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 11220 bytes
SHA-256: 0ab447dab8f33181a42228bb3f8910bea0fefb98cee89689352873ad38448561

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