Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9873d3806d11dfb…

MALICIOUS

PDF

73.1 KB Created: 2021-03-24 02:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6207254e49ad6a6157c5d302416486b9 SHA-1: b66aa506e0cd8512fe60d23767a990ce94d54ec7 SHA-256: c9873d3806d11dfb3154ec0929df7172e4bb7806b67418d20cf02638a92d4edb
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The presence of a 'download' button lure further supports a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=asos+boots+size+guide
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601281be4d58f.pdf
    • https://sorunamupojiwek.weebly.com/uploads/1/3/1/4/131407183/xawodarufa.pdf
    • https://dawudetunik.weebly.com/uploads/1/3/5/9/135972975/fiwemi.pdf
    • http://logunej.iblogger.org/gukiviwegawixemewakoxan.pdf
    • https://redefanugolikiz.weebly.com/uploads/1/3/5/9/135975275/raruxafut.pdf
    • https://cdn-cms.f-static.net/uploads/4463308/normal_60276c6f1457c.pdf
    • http://vozaxakinexu.iblogger.org/56934996823.pdf
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/lubezavovaroveke.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_60430da20635b.pdf
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fd61eb9bc123.pdf
    • https://xuvosaxefon.weebly.com/uploads/1/3/4/6/134605895/lajunol_linalo_pegixijobagegi.pdf
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/wiverewemane.pdf
    • https://tonulaluxi.weebly.com/uploads/1/3/4/0/134099082/3497142.pdf
    • https://static.s123-cdn-static.com/uploads/4499636/normal_6009a81aa0c3f.pdf
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/4803414.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bideliv.rf.gd/boords_storyboard_template.pdf
    • http://fetakeseravisu.epizy.com/test_automation_using_selenium_webdriver_with_java.pdf
    • https://uploads.strikinglycdn.com/files/fec72e66-51ca-4704-b5cd-b7c21c788641/rokozazifavejof.pdf
    • https://uploads.strikinglycdn.com/files/09600a54-2740-4d3d-a07a-18a4d3067555/gutazijulotudonomigaz.pdf
    • https://uploads.strikinglycdn.com/files/c9bf7af2-63d6-4586-9507-ec93aba50fd5/fibufe.pdf
    • http://kavunuses.epizy.com/generos_literarios_libros.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_off0000e100.bin
3298aaa405d21e6c923cc6eeee5029ea6f22e211e8dc8cc1ce95c7d970d159b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 4832 bytes
font_01_sfnt_off0000f18d.bin
2b3952e19a76acfc7ed309f77fa04cd239a405245799ca562f0bfcb5f7da9a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 11148 bytes

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