Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e84b7922ccd4a5…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 09:22:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65fe7aba96028314197deaad9e839502 SHA-1: 5afbb543ec4de974b70a7cc90bf2f739be84f307 SHA-256: 87e84b7922ccd4a5c67e465ba778a1c506d844be09c0c4401acf14f3c0f765ef
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, pointing to various PDF files. The primary URL, https://botokaw.ru/wix?keyword=short+term+effects+of+oil+spills, suggests a lure to a link farm. ClamAV detection and ML classification confirm the malicious nature of the file, likely used for phishing or distributing unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/wix?keyword=short+term+effects+of+oil+spills
    • https://cdn.sqhk.co/fejisedetu/jZhf5if/wuxuvoxukorakuvo.pdf
    • https://suliwire.weebly.com/uploads/1/3/4/6/134650608/b15acf796933d.pdf
    • https://cdn.sqhk.co/mamevugixej/bhghhOU/radio_cadena_100_barcelona.pdf
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/moguxatixaf.pdf
    • https://cdn.sqhk.co/xexisini/UidicUK/rojosa.pdf
    • http://lixixivukagoda.66ghz.com/offline_bible_dictionary.pdf
    • https://cdn-cms.f-static.net/uploads/4500187/normal_6041561bd5d61.pdf
    • https://static.s123-cdn-static.com/uploads/4477137/normal_5fe3a8633455f.pdf
    • https://cdn.sqhk.co/sikudile/hehcBhc/27349215394.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pilazi/3592706388.pdf
    • https://s3.amazonaws.com/gapivegek/90103954476.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/dolovo.pdf
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_fa7778e2c64e461193f83f18654d1dea.pdf?index=true
    • http://sosodif.rf.gd/xetewigavaj.pdf
    • http://fonumorawupako.epizy.com/61642779676.pdf
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_794af5b75a104a728090207652d41f3f.pdf?index=true
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_2fa4c11f43ca40db9458a021efe6fa6f.pdf?index=true
    • http://remigesej.epizy.com/nibemelefuluxesamofap.pdf
    • https://s3.amazonaws.com/wofaxil/11387323531.pdf
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_47a950447910414f97c418183cb2b97d.pdf?index=true
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_30027b8490634a429ded2f72ba13fe0a.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_off0000f32f.bin
e23c4c8d7af7a08ccc79507ef7f5180ce2753926869e6214946f6ea532ee4f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 5148 bytes
font_01_sfnt_off0001048f.bin
6407ce59070aad45d5e003d8d163b1b4515ab3813935e48c69cbf6d8fa4d899f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 10184 bytes

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