Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bbe9ff780748ef…

MALICIOUS

PDF

89.8 KB Created: 2021-09-21 15:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 430af342470b90bf22662b0e34cee186 SHA-1: 44517816ee03fe491a9d08148442b7a08a0776dd SHA-256: b4bbe9ff780748ef532d9cd8ee4c1744b0a863e3a032ce4f9d63c15f2477a45c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to distribute links to disposable hosting. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://impressivetravelvietnam.com/upload/files/vajigelifivevalovuwofufov.pdf In PDF document text
    • http://lahma.pl/_u/userfiles/file/37913402289.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/7258038415.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/dugonusufuvesigawinax.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/mukipozonulosejevan.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/binexapoxajizo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/32168257117.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/97060620765.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_5D23BA539CA3C7CF.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xagasaferi.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/tekisezogo.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/puwolulotogorita.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/wuwara.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d0a186d0c8551c0698904266140120db/210298977.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109171706387429.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/58816323049.pdfIn PDF document text
    • https://ocw.tw/uploads/files/gerobesezapuxeropagejudaz.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/paxesig.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/17785429525.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/23997090548.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/77628729647.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/74455806581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aplikacja+dla+dzieci+androidPDF 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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 19160 bytes
SHA-256: 19df1df3ed83bd4f199e9ae02c73b5b9cde88fa88de9b568140060b7c264f217
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 10504 bytes
SHA-256: 8dc4db5fa07437e89593ba6ffbcf2fbd43813585fae1b1be6dea829eea8484a7
font_03_sfnt_off0001410d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.