Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8c64db8728601f…

MALICIOUS

PDF

89.7 KB Created: 2021-03-10 00:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3a46283c314564e5d0e1de6c7746096 SHA-1: 39b9e1e2714c8d4cfa51d2c68b87f983b9f591f4 SHA-256: be8c64db8728601f71294b8e4a13d6c5695664392744eb4ff302e90610828414
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URIs suggests an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=learn+c+programming+in+hindi+for+beginners
    • http://wimuzawoxi.getenjoyment.net/axis_and_allies_miniatures_expanded_rules.pdf
    • https://votujejigep.weebly.com/uploads/1/3/1/3/131380583/9546819.pdf
    • http://priz24.site/iadt_dental_trauma_guidelines_2016cyzck.pdf
    • http://canonsburglake.org/gst_ka_full_form_english_meinqy27s.pdf
    • http://reznitskygallery.com/why_the_book_of_enoch_was_removedbpn4g.pdf
    • http://13millions-warzone.store/horse_racing_3daxe17.pdf
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/9342211.pdf
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/6dbce.pdf
    • http://winoraama.site/solidworks_weldments_exercises4gax2.pdf
    • http://health-top.ru/how_to_use_dj_controller_with_seratog8eqc.pdf
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/pizenura_difiruxiwaf.pdf
    • https://tefafovok.weebly.com/uploads/1/3/4/5/134588422/dexuziwuxujiju.pdf
    • https://lirigudufov.weebly.com/uploads/1/3/0/7/130776684/siwajojewalitigefas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kabuzore.atwebpages.com/jagiw.pdf
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_ee12349f562c48e49ea25c0c5f2dbab2.pdf?index=true
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_04e01abcb26a46909c7c1c5ec1867cc1.pdf?index=true
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_a820b7d6e96241cdad2a2b550d035efc.pdf?index=true
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_5498fa7547ca4069b9befec7fa77d70b.pdf?index=true
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_d96d9641ce5641729250513a009f1fd5.pdf?index=true
    • http://tebaputazaxuva.myartsonline.com/73881924021.pdf
    • 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
    • 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_off00010b1d.bin
88e7295aaea43cf8a4bbab9f677aa5b60565ed2f99ac1a0bb691c7bfcaa04b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 5616 bytes
font_01_sfnt_off00011e0e.bin
5f502942debbb1b29888b33498d487139bc5a4867363ad7596d7a77347a87e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 11168 bytes
font_02_sfnt_off00014439.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14439 16060 bytes

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