Malicious PDF — malware analysis report

Static analysis result for SHA-256 e430fbf1449ff65c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 10:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9e461e322d9ebd1a15fe56c1ff9d80a SHA-1: b4a53b723d4a81f28c61c6efa1124e4106677118 SHA-256: e430fbf1449ff65c5ea63c094c750da21a444e7ca5e7828860e2fb2aaaaaa1e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent, likely for phishing or scamming purposes. While no scripts were explicitly extracted, the presence of many external URIs and the ML classifier's high confidence indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://land89.com/ckupload/files/79747868023.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/xasolagomipifonu.pdf
    • https://ijaetis.org/ckfinder/userfiles/files/28402291242.pdf
    • https://costabravas.com/uploads/localidades/files/wozogavo.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8fab343857fa8c0ba5edf5f15cefa8f1/xovekimipit.pdf
    • http://icaalliance.org/filespath/files/20210907003755.pdf
    • https://mcdelandes.ca/uploads/file/72068834779.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pagef.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/44216728557.pdf
    • https://kingwrapcarspa.com/upload/files/visarenuxumasoma.pdf
    • http://bannhuaduong.net/upload/files/12708427265.pdf
    • https://nidi.mk/ckfinder/userfiles/files/79753160722.pdf
    • http://robfredo.com/userfiles/file/zajagurubikedov.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/74440548911.pdf
    • http://bsinteriordesigner.com/userfiles/files/83371408407.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36168581573.pdf
    • http://dreamcatcherltd.com/userfiles/file/34147418262.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/76730000174.pdf
    • http://ourpreferred.com/userfiles/files/pevusinidevegokog.pdf
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/28821599571.pdf
    • http://adamlegal.com/userfiles/file/43746704626.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/mowerewifasotukovo.pdf
    • http://bidadapatidar.com/userfiles/file/85537749275.pdf
    • https://mashtalkandil.com/userfiles/file/juzolira.pdf
    • http://curry-box-deluxe.de/userfiles/file/75648373842.pdf
    • https://mattress-leader.com/media/lusurates.pdf
    • http://ranaghatpchsschool.org/userfiles/file/27156913550.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nioh+2+golden+gourd+smithing+text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 16792 bytes
font_01_sfnt_off0000d72e.bin
fa4f5e6bdee23adf2e5b31fee0b385a370dbf0c893920846d39827cf8f21006f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 17064 bytes
font_02_sfnt_off00010341.bin
c6065165f10d85f4db8df62c5158520d27f406dde0379027d6db2ce7db714274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 10832 bytes

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