Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d09dcbac1358c4d…

MALICIOUS

PDF

75.2 KB Created: 2021-04-05 00:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381f48b23145d2f54b0e0d8a216feb24 SHA-1: 26f601e2a16b767ff73d47226a6634191510e603 SHA-256: 0d09dcbac1358c4dd5f9debc410ad136f461cc8cce19226cb78f6b24717781ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are generated to appear as SEO-friendly content, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=application+of+biotechnology+in+pharmaceutical+industry+pdf
    • https://cdn.sqhk.co/nizidevogaka/ibV40hd/41170558789.pdf
    • http://1fps.ru/whirlpool_gold_series_fridge_troubleshootingcgex2.pdf
    • http://marketes.pro/mifusenivpjoht.pdf
    • https://cdn.sqhk.co/fixakozumad/jRhg9Sx/metodetugufoluto.pdf
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/4182972.pdf
    • https://bididanigatozum.weebly.com/uploads/1/3/4/3/134314142/e60ffc.pdf
    • http://presentinsta.site/69932740066xy37r.pdf
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/681626.pdf
    • https://sarajifig.weebly.com/uploads/1/3/2/7/132710715/walipawazuduted-xibofirup-faxuxeb.pdf
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/df12c6956ed105e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_2a6a5bcb76b5447b87bbce2cf8434f35.pdf?index=true
    • https://s3.amazonaws.com/timituvupame/numozalavedizibalarulumo.pdf
    • https://s3.amazonaws.com/ginutu/xojuvemasajupusojovemuve.pdf
    • https://s3.amazonaws.com/jesidofefe/letter_coloring_sheets_for_preschoolers.pdf
    • https://s3.amazonaws.com/fejakixoweka/how_much_do_starbucks_coffee_machines_cost.pdf
    • https://s3.amazonaws.com/vuliwisuwig/fepufi.pdf
    • https://e62d90d9-845b-491d-b9b1-804d55ccd6e6.filesusr.com/ugd/6af1ed_823989babc8a45fda55f24d63912e4e0.pdf?index=true
    • https://s3.amazonaws.com/zerepuzuze/frankie_and_benny_s_menu_uk.pdf
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_044c63b24af943398053af92736b2020.pdf?index=true
    • https://s3.amazonaws.com/rezugekolaba/11131850443.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_fc942ba5ca864807a6328e84067579db.pdf?index=true
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_2d8c6a470f774f8bb84b8f1eee5345b0.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e878.bin
a922c241076773dce0feb9c33d43371f651f130151ad2d127af63fa6106d6124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5800 bytes
font_01_sfnt_off0000fc17.bin
564581bb1a78cd84a01fc98ccf316b1ceb85404660d7c250f2e17c6e1a232393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10016 bytes

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