Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fee74eb07a57b37…

MALICIOUS

PDF

75.5 KB Created: 2021-01-31 03:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbea450adbffdfcc29d5eb55673f2356 SHA-1: df20ee31c5f12f3e29473e9ca595a43be7991ad7 SHA-256: 9fee74eb07a57b372f556cdd9bcf8048b8aefd1daad512ff355364e4e83b2ee4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicative of a link farm or SEO spam operation. The document body, though malformed, suggests a lure related to 'comparing ratio tables worksheet'. The presence of embedded URLs and the sheer volume of external links point towards an attempt to redirect users to potentially malicious or unwanted content.

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://druttle.ru/123?utm_term=comparing+ratio+tables+worksheet
    • https://cdn.sqhk.co/puwidebudojo/0vnXhci/lightroom_presets_free_instagram.pdf
    • https://tunizobun.weebly.com/uploads/1/3/1/0/131069832/9df41968cce434.pdf
    • https://cdn.sqhk.co/wuvevevef/jdjeOhd/dj_loop_pads_online.pdf
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/mixapefomow_pafuxedoj_vuvapu_suwugafi.pdf
    • http://mivakoxukike.22web.org/67416090691.pdf
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/d892bbd.pdf
    • http://jeruxawi.iblogger.org/netuzifowikibogupufo.pdf
    • https://pabametutib.weebly.com/uploads/1/3/5/3/135317572/ritor-lifowofotafe-tokeluso-zogumiremiw.pdf
    • https://cdn.sqhk.co/jovojatubo/jahbhcd/31639883026.pdf
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/kekolebimusow.pdf
    • https://cdn.sqhk.co/xavonepez/3WCRrri/80330008030.pdf
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/9212076.pdf
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/mupotuxigozo.pdf
    • https://cdn.sqhk.co/pofifarim/hZPHvhi/zadevakaxefigatufip.pdf
    • http://bimiwefumukiv.22web.org/daily_attendance_register_template_excel.pdf
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/gevavapivujakavosu.pdf
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/3a825d9f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuganireriwem.rf.gd/oecd_guidelines_for_toxicity_testing.pdf
    • http://lowebabufi.rf.gd/34731293125.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_off0000e780.bin
bd3c82af01d77de193f9603b80e97f1e3b89c759d238da3460e46af614e67f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 5436 bytes
font_01_sfnt_off0000f9d7.bin
663dc2823161ca735afff0437f6945b22a3991b98132812f99134a580323e16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 11220 bytes

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