Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb90312ba37eead…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 02:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dbb85ef09c9ab137e22efd896d56ea5 SHA-1: 1878f180df60cf767fde87683bdbe25c34556107 SHA-256: fdb90312ba37eead877a2521aef9cb76239d40d5e80f7cc98fd1eb4a92b93dcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.channeloflove.com/ckfinder/userfiles/files/furoka.pdf In PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091412282480554.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/56123730418.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/59179445913.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/vulotovus.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc671d365a---dadebibolilosoz.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/jesumisukasu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd681cf8c2---67705209817.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109140544136777.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/22253926118.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/vixafovaretapevurewana.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/jutixerilevinadexuvuzek.pdfIn PDF document text
    • http://dalaichau.com/files/77731595435.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210907052645405.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/duxuxavumeb.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/wumonavarep.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/76332676044.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210912105216.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904031812.pdfIn PDF document text
    • https://blv.by/upload/editor/files/zatibemofovuveli.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/0a2c28e17dc6c0edfb37da003093f194.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/babipagemebixotab.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/kigamomimalileni.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/37552501861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pete+nelson+familyPDF 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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10392 bytes
SHA-256: e0dd9a6676a0718df59f74658d8b1c13ed3ac5dfcd41fadb26ea70188491747c
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 17480 bytes
SHA-256: f78ca0e392de84bb4f237d7e4ab4b60ee21d2f705c375a0b0d0071dfa84a5a98
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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