Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a811c9c23ffd3f…

MALICIOUS

PDF

80.6 KB Created: 2021-04-10 11:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8113ab50a9dfd3baea075c2b6b67e13b SHA-1: 64c6b14508e61481b47f86ea289ee15a605a9726 SHA-256: c2a811c9c23ffd3fbf82f0f0e21402020976c68cb1f390c1c51195768a2153d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious destinations or manipulate search engine results. The document body's garbled content and the presence of numerous external URLs strongly indicate a deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=bose+qc15+headphone+replacement+parts PDF link annotation
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/yasin_dua.pdfIn PDF document text
    • http://tpdreport.com/xolemopzii60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_6056608493282.pdfIn PDF document text
    • http://erogan-encolumbia.site/60828616841h77lm.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/jalaveburolijis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_6051b099c5c02.pdfIn PDF document text
    • http://static-start.top/36675668316wml5m.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/2680681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff3f2199c737.pdfIn PDF document text
    • http://optamorem.com/fonumipawidubm7l9o.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/noxenulekeqqh95.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/kereju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_62cbb93abf4a44e998f81c43ed4f2662.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_87cd29cf6643417a8eb432369dba56b0.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_8487f6e3fcd94dbb94c9dbdf6f68c7b3.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_85459ca00e244b029d8c669853c803b7.pdf?index=trueIn PDF document text
    • http://ditanumugagoma.myartsonline.com/jboss_application_server_tutorial_download.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_1a0288881dc74e77a55e55d0a170b5e1.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
    • 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_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 5664 bytes
SHA-256: 0134bad7f0ca9a51f660ea12a95044fa94b648f6d02df2b3b6937681d76c66c6
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 11100 bytes
SHA-256: 59aed229a2a31b81980bee1cd548e44ec3ab54c9e989fbf46827c2eee563186c
font_02_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1