Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02fb3899f02c41e…

MALICIOUS

PDF

95.7 KB Created: 2021-09-08 16:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 581209ac7c0dc15d40e0593e6014e5cd SHA-1: c24410c51d6362fb4391c02d5f6ee92119ea009d SHA-256: b02fb3899f02c41e989bc5c5458e8721cf1bdc806a8e33e71093535fdd213a87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://koryosushi.com/uploads/files/36830888844.pdf In PDF document text
    • https://fluffy-chins.com/images/file/bogukepumojekukafe.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/76023134638.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d373c7aeb---66583939751.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/23984646153.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/16999056294.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/49100275140.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/5612065397.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/83720898887.pdfIn PDF document text
    • https://chineseclothingonline.com/File/85407791589.pdfIn PDF document text
    • http://aa-nusd.jp/89059834915.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210906164739.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/71916734387.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/31213198570.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/wufupujidosinoxelogideba.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zorumopusubemikekak.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c51187a30---baren.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/16465528387.pdfIn PDF document text
    • https://webhosting4.net/media/file/83430395835.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/15182031635.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/winapizupijugu.pdfIn PDF document text
    • http://planetamama.ru/files/file/33817847116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=c%C3%A1ch+chuy%E1%BB%83n+file+pdf+sang+word+kh%C3%B4ng+b%E1%BB%8B+l%E1%BB%97i+fontPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 25576 bytes
SHA-256: 7b02d95ad423041312a1813da7312a7f046e50514d41e467c735ad15b8f57c9c
font_02_sfnt_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 12420 bytes
SHA-256: 59502b0427bf6dc13890520cc7e4d2ccd486c736382e00a34f041936683f8545
font_03_sfnt_off00015678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15678 16528 bytes
SHA-256: 4caff1e1a72018ff332450531c92a5b66c09846295c1d8c25d08606f3fb3e024

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