Malicious PDF — malware analysis report

Static analysis result for SHA-256 3612850318d3e025…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 19:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a1070ae410fbbcb8d53563df8f78718 SHA-1: e89320dcd490bff3c4242eaa7c8ff4a6a8adb19d SHA-256: 3612850318d3e025a04666eacba7e019aded9cf409ec691930aa11c67eef417c
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 are hosted on domains that appear to be link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to multiple external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://study-abroad-travel.com/ckfinder/userfiles/file/33746422922.pdf In PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/34384366006.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/mujajotumufamavonorokosab.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/61512154500.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/wezikafabag.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3be17ec6---joguxutolituwinekerego.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/27016078403.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///3302052959.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafb546deb---85826825375.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/punujekegoxozagan.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/80376723544.pdfIn PDF document text
    • https://hssanesteban.cl/files/xobimime.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/5317987176.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/totepu.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/79441115496.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/87479894289.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tetukefebifixisavefemiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2020+skyline+gtrPDF 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_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 10352 bytes
SHA-256: 1b67c11bc2cfa397aa236fc4ae1e5431a77b437cd17d3e8e2270ca5993ce6950
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 18132 bytes
SHA-256: 28a27a2142a3d8a7e15a9cd92165120e3d260bd6fa403a25998aedb1031241bd

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