Malicious PDF — malware analysis report

Static analysis result for SHA-256 168c1b5fbb98fc8f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 07:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c3a81fa3c57b30599f9e5851f8320b1 SHA-1: bba3dd588389880955c003c675c2e52ec82f345f SHA-256: 168c1b5fbb98fc8ff588d050eefa2035369b5fa0e500fd8c0b81c2ee68359fc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of phishing or malware distribution. The PDF structure and embedded links suggest it is used as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=otg+connection+setting PDF link annotation
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/28406607927.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/benax.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/1244871125.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/xixupiliwibaxedur.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/47594904291.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/jojevotud.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f4a1abe5460effaf49c1b32fc600165a/94974180072.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jobovikofuj.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wafokemedugilodopun.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/51166205415.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/winozef.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/wuzabifumotove.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/94515754683.pdfIn PDF document text
    • http://csp.hu/editor_up/sotasamuguloridabegimebo.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/39694598019.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/jidujuwi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/bopefawip.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/75270938122.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/wapazub.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/gipaxi.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxasewe.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/89141799608.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/bimekijuze.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/23814318897.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/sumofubekimox.pdfIn PDF document text
    • 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_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 17288 bytes
SHA-256: a278a5b99db42a09121edcbe3de6c7f29e6aaf690ba2419d2f332b2717e264ea
font_02_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 10120 bytes
SHA-256: 0da98675354b0ac85a43be6162b51691c88a091c35e0f72a009ae29e159249ae

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