Malicious PDF — malware analysis report

Static analysis result for SHA-256 6137f81990076a5c…

MALICIOUS

PDF

72.4 KB Created: 2021-03-21 02:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60bdc3d701520e8b8bdb0891030f2f9c SHA-1: 1f3f517a849308de810cef32d451cf9d8eb0ea03 SHA-256: 6137f81990076a5c7d8ab6bae926eb6ac62e95c881e338c74227467687ca9a72
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, characteristic of a link farm designed to manipulate search engine results or distribute further malicious content. The primary IOC is the external URL https://bologen.ru/wix?keyword=war+in+the+pacific+worksheet+pdf, which is likely the entry point for this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=war+in+the+pacific+worksheet+pdf
    • http://xejopegig.mypressonline.com/gopowaliwonefemuxap.pdf
    • https://cdn-cms.f-static.net/uploads/4486548/normal_60135b0cdb1d9.pdf
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5fdab8c796453.pdf
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fe6ec18dc665.pdf
    • https://static.s123-cdn-static.com/uploads/4420230/normal_6004a53d8081d.pdf
    • http://zabovawupe.mypressonline.com/coraline_book_download.pdf
    • http://vatidenow.medianewsonline.com/58169639563.pdf
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/3635753.pdf
    • https://cdn-cms.f-static.net/uploads/4413986/normal_60205ea7b7021.pdf
    • http://lirinevewafa.mypressonline.com/kukixobikijepozemezodutid.pdf
    • http://gaximivotekole.mypressonline.com/gofuveninav.pdf
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/3912615.pdf
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/72b877d.pdf
    • http://mateguwokalidub.getenjoyment.net/49298411845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed17de4e-06dd-426c-8dc0-12e5252ee6fc/98815157923.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_47d0aa305f5440ca882039df2d43aa4b.pdf?index=true
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_12f08380a8c24cb5abc4776ad73bfa8a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93a54c38-0220-4430-849e-867a35c2db92/what_day_is_adoption_day_at_petco.pdf
    • https://uploads.strikinglycdn.com/files/62848d6d-3b49-458a-a2fd-c984d873bbac/is_michael_lucifers_twin_brother_in_the_bible.pdf
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_4d6aecaa94874b26b9a262bdb7ac376a.pdf?index=true
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_93eb2554dbf94f8b85e27850b08bb1aa.pdf?index=true
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_45a0011802e1414a93a29d1f3aad8c1e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81c6ccfb-adea-4106-9e52-fe5a558ae5dc/74408030373.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_off0000db6f.bin
d428ba01f7b13c2e0408acf213b4bf491c5a7d37f048e46e08a08da605bcf7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 5380 bytes
font_01_sfnt_off0000edd3.bin
f12f1bf458c9e841b43167c71edf0937d9e096403764bc0a8c5503b8ca3ee508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10800 bytes

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