Malicious PDF — malware analysis report

Static analysis result for SHA-256 56334aa19cade0c4…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 09:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fd82b2a77cfa08218cab3c2d8706078 SHA-1: 794f3f440a2246965ad4ffd5a51e25335ea46f87 SHA-256: 56334aa19cade0c482a899bf466c4e9274644d2514d810231919e05233100f08
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://seumenha.ru/strik?utm_term=what+draws+out+boils
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/8562910.pdf
    • https://sedeberelaniku.weebly.com/uploads/1/3/6/0/136030724/589fef926b6.pdf
    • https://zuvopejibi.weebly.com/uploads/1/3/4/0/134017525/3621863.pdf
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/4020358.pdf
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/movivijin.pdf
    • https://pikiromubivi.weebly.com/uploads/1/3/0/7/130739210/5018874.pdf
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/demitevove-wipoborapux-zafenogamokuz.pdf
    • https://mefirotevi.weebly.com/uploads/1/3/5/3/135314773/tepixozuto.pdf
    • https://xuduzaximebawu.weebly.com/uploads/1/3/5/3/135315026/lulimataxaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_d91fbe05a1b74e7eb3c2997023ecf771.pdf?index=true
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_c9f3ee3dd42b480694456c628a6a5687.pdf?index=true
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_8279d3a66647483f84b8bddc1b622536.pdf?index=true
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_f086641f5afc40219311da45d667310f.pdf?index=true
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_205e567593c64c6988fd2bf563673894.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4e9e406-5534-4f8b-ae95-53f5b7c2ebc4/28500092251.pdf
    • http://wagewatudol.rf.gd/starbucks_cold_cups_summer_2019.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_0868b66b5159435f95ad634fd91bebbf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/beaf9dc8-cc07-468a-86d8-feb4c520f6c0/74598889342.pdf
    • https://uploads.strikinglycdn.com/files/e1d0faa0-03b7-42b7-b539-78c0ab9459b4/58644420390.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_f569f023e2e34633b31d6b2fa27a74b2.pdf?index=true
    • http://kidoputuf.epizy.com/cinderella_fractured_fairy_tale.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ed.bin
e36cf3aa815b02ae73da96e77754d323222ed63a680894d51faf85447eaf3ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5160 bytes
font_01_sfnt_off00010383.bin
f5b1cb80345965a10fb9d2eeffa81ebfa2ea1077435940ec0e1993b52055c962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 10480 bytes

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