Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6d77dc24f195ef…

MALICIOUS

PDF

78.0 KB Created: 2021-04-01 16:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb727fa396a0c76593d8579b4f330573 SHA-1: 215342467d0545d42748bcd34010d7aa34ba0cd3 SHA-256: be6d77dc24f195eff7b035cb444ecc374e184d85ff140b34f86fd42e146efd3d
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 point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript or other exploit mechanisms.

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://vilenefex.ru/aws?utm_term=presidential+traverse+shuttle
    • http://vas-rem.ru/birthday_cake_images_for_man_with_name46c4w.pdf
    • https://mejofeva.weebly.com/uploads/1/3/2/6/132681501/gokone_vowukawi_ziwukufobu_kekibawe.pdf
    • https://xumipapabof.weebly.com/uploads/1/3/4/6/134609146/484999.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/sodalinowitun.pdf
    • http://yildirimotobursa.com/craftsman_8_gallon_wet_dry_vac_bagshqvey.pdf
    • http://groshyk.site/14990684916cf5yb.pdf
    • http://migriruy.ru/suvuwujerazutemipiol0ju.pdf
    • http://mazers.fun/the_adventures_of_tom_sawyer_summary_shortko9iq.pdf
    • http://nat-yoga.space/titavelitodupodewof97zq6.pdf
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/zalarebilabukaw-bobelalewa.pdf
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/goxinuxivewuge.pdf
    • https://miwawedunosojoz.weebly.com/uploads/1/3/1/6/131606480/6637ae0.pdf
    • http://theandyhong.com/breathedge_achievement_guidez2m2q.pdf
    • http://nuverlites.online/what_does_electronic_communication_means3p2re.pdf
    • http://detonic-italia.website/jekiwesatugevaxepituwy2e8.pdf
    • http://thefortykuti.com/gadejidoe068q.pdf
    • https://zufezoro.weebly.com/uploads/1/3/4/8/134885884/kuxidor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_cb6248086f154b13ae3fb24028904218.pdf?index=true
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_9de3e163b7374f3988c4a7917ac4e802.pdf?index=true
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_1fad81d7220c4e43bc001de1fa7f76fc.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_13e6437bb34a419ab64c97297b85c961.pdf?index=true
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_9f2c7b58e827453a8ec63b9c09518914.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_off0000f4e6.bin
be3db8eb6d26cf0b966ce1a312868e61ca616f1bd905d8957fb5d2cbf8975399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 4972 bytes
font_01_sfnt_off000105c9.bin
4fa6c5554a36d7908199422cb50b233deac9d9615ffbcc02a8195122f4d59823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 10768 bytes

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