Malicious PDF — malware analysis report

Static analysis result for SHA-256 659ae5ffff17173f…

MALICIOUS

PDF

73.1 KB Created: 2021-04-05 01:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12e37a95771b5a09b91f7ea6aaebd37c SHA-1: ae2fa6c5d4e82c69ce8a1351e10cce37dc543464 SHA-256: 659ae5ffff17173ff946ebac97e7ce3eff8e34e2f8d09788f1d15d8a14188edd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=utility+function+questions+and+answers+pdf
    • https://cdn.sqhk.co/nopawuwam/xHnjihb/weather_app_icon_white.pdf
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/jaduxuwajopunop.pdf
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/kinom.pdf
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/8cd8da02cfd.pdf
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/3921964.pdf
    • https://cdn.sqhk.co/zimopaji/j0Cr55W/48759321531.pdf
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/80aef14b.pdf
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/gabibezo.pdf
    • https://falosaxosudo.weebly.com/uploads/1/3/4/0/134017699/vewer.pdf
    • https://cdn.sqhk.co/semiwewedazi/jjIibIa/sioux_falls_building_services_office.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_ed7bcf5d0cc54dfeb5fe37469883166d.pdf?index=true
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_a2f9a3c155784ee3b4ff95f847adbda5.pdf?index=true
    • https://s3.amazonaws.com/nigimul/bejefubesovesokeni.pdf
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_db9aff186ad24041acd3f3579b478b00.pdf?index=true
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_fc3f26f11f914ce9a33fa07e643e5a4f.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_de17b1cf3c894b35b36e43f42d17f177.pdf?index=true
    • https://s3.amazonaws.com/jidagafinuxesu/61444698364.pdf
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_ca45bf54842f414e9a21b823a14ec570.pdf?index=true
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_7d77a86bf6ce42c3ab8d9584e5b8a076.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_off0000de1b.bin
4c994da20d0a6bdb26c09b20f31aa2bc6a70f22d7a4f6c9828337aa52041bab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 5460 bytes
font_01_sfnt_off0000f0df.bin
409dca7c2f0a9a2a0c9cf33bf842749dc3168036b45bd1058a1fef50f5957e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10664 bytes

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