Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8ee546d1796537…

MALICIOUS

PDF

98.3 KB Created: 2021-04-25 05:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdeeea2ae91f81f01f065022f016a105 SHA-1: aaa23183326191e800a192a197cc521c2503f2a6 SHA-256: 9a8ee546d1796537f94629392611b79651669d11a037a53d6aacc0dcbfc1f339
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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.
  • 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://botokaw.ru/strik?utm_term=signs+of+auditory+processing+disorder+in+3+year+old PDF link annotation
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/6843128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_603eec578317c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_600a45ac79faa.pdfIn PDF document text
    • http://lixidepobejoji.mypressonline.com/xazokafusopixe.pdfIn PDF document text
    • https://makodute.weebly.com/uploads/1/3/4/6/134649936/e3a1230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5ff6c507a7e5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fc848ec6439e.pdfIn PDF document text
    • https://zematewisa.weebly.com/uploads/1/3/4/8/134897668/9220388.pdfIn PDF document text
    • http://persequenteamsohbet.com/xidosunegulowudisepi5t74j.pdfIn PDF document text
    • https://pejijogukuto.weebly.com/uploads/1/3/4/7/134768892/5d9a3fb48371f6c.pdfIn PDF document text
    • http://manthoughtswebsite.website/fikolojoliruwowepvnrqm.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • http://smcjd.com/92117470705p8i0d.pdfIn PDF document text
    • http://banquepopulaire-fr.org/chapter_10_cell_growth_and_division_vocabulary_review_answer_keyy3wpp.pdfIn PDF document text
    • https://fefosixofenovi.weebly.com/uploads/1/3/4/7/134755919/pojeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60135fed90712.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/guvuzujamasimiselu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_0893bb693d8e4fc58730709b251e3044.pdf?index=trueIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_6d0aa0ef1d36449085013541460d00dc.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_a042b9547d4141f49fc9e0463ef4d826.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_1f1908a55766456a8fb8f807c6e5b416.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_ef9f0be635d6480cb8e5e00e8e0cf8d3.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_a36ada70a9e84c0188bbe62840556cb2.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_a345c3b16be247d5915d7f1352260177.pdf?index=trueIn PDF document text
    • http://vekisofekibote.myartsonline.com/romeo_juliet_quotes_baz_luhrmann.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_25df597ca2cc4d17a4c0663d763c2824.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001419b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 5692 bytes
SHA-256: d3423fc1c2805253b1bce35627529c3c6d57c9808154efecbff531edd899140e
font_01_sfnt_off00015519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15519 11384 bytes
SHA-256: 10fae6d3cccde79c8237db2592bc72a4d2b4ada7a4d5a830def0b8247e26b7c4