Malicious PDF — malware analysis report

Static analysis result for SHA-256 6531b1b04cf80307…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 12:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b33970e32f5d873cbdb965f14c75924c SHA-1: 1d7429d96dd5a4c4825bea9f3ce17edf8c21d9b3 SHA-256: 6531b1b04cf80307c1aa1b70b3b7d9049c4fbd3728ebfd39765f5521cc6cddad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=the+strong+ones+2019+online PDF link annotation
    • http://mnwebdesign.dk/userfiles/file/kajikefufapor.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/zuparikokokobeni.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/58423277558.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/67475604933.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/labovuduvig.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/subosuretoburovonuf.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/xomoxejuzo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140524d402fd---sozapatu.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/81293871366.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/deganun.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/dexovakojizitovuwimuw.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/xefiwogarapenifulosa.pdfIn PDF document text
    • https://businesslife.com/content/files/bonapipuvebo.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/mozuxumufabulegamejik.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/40166577904.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/34030873106.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/vevez.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/mopejemavosokar.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/78393321107.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lowiselabatu.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/zapaselesexax.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/duzazaxipokafimix.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/wezoxexanapegobunatas.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/5980004949.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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 10648 bytes
SHA-256: 8c9f03db27fe2d2093ba5dcef9187d95bef99dac11f0c1fe74f5db57bf7fea51
font_02_sfnt_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 16084 bytes
SHA-256: a60949da259962b57f2b3c86b23324ccc782d29e2856b29899bc2bc425bfc2ce

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