Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb784324825f0b5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 08:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9298bf81e3769aa09ddd1eb72b158c7e SHA-1: e38ec143de4423d13382ae945053a3f317908a54 SHA-256: bdb784324825f0b5caf6dc97da7a1f99282b388e8144e1689cc87e2ec78e129d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mobile-translator.eu/app/webroot/media/files/xinedinafafixoxewir.pdf In PDF document text
    • https://smilaxlabs.com/userfiles/files/66107837313.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/79230439351.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zolefidotexil.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cef43ddd---74510959883.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/wabokitax.pdfIn PDF document text
    • http://maihome.hu/admin1/file/68989068278.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/24663529611.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/turekezi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1t0fie2hem34bcvfo4ap72ksl4/ludesikanazofikoje.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/patumugumufeta.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/vipijik.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/422932875.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/66818816489.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tazememazudotosilodiseji.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/gejarokekilosumaxekip.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/6022861212.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/tenivodunawi.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/bimonodib.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/23681116185.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_F251C8FCFB06B9BD.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/75499988088.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/45417368119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+developer+adsPDF 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_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 10336 bytes
SHA-256: e384c7f895d14e65450901bb31c8a95eab6f9d204891e4a9e39f2f4ba6d3e252
font_01_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16632 bytes
SHA-256: 442b279838ba9b8b19ef7532bd9909fad2679546b29526543bd198a31a212b2c
font_02_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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