Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30b6c6379e826a3…

MALICIOUS

PDF

90.4 KB Created: 2021-03-20 04:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db2493dbf34bb8ee1bf0216491efaea8 SHA-1: da9d4171c4a968bdb2638de9f824667617e70ec3 SHA-256: c30b6c6379e826a3b5bcb5b74228fe8eb4d9f9c58bb3063ec3bf2500131c5222
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, a common tactic for phishing or SEO spam. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, suggesting an attempt to drive traffic to various sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports the malicious nature of this document. While no scripts were explicitly extracted, the PDF structure itself is used to host and present these malicious links.

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://kuzutuzo.ru/award?keyword=aplastic+anemia+pathophysiology+pdf
    • https://fekogekakoxoki.weebly.com/uploads/1/3/4/6/134625435/fagowujumefosof-kipalewuv.pdf
    • http://zukesijinizik.mywebcommunity.org/52927469537.pdf
    • https://fudidokogi.weebly.com/uploads/1/3/4/6/134603759/werimatisa-wefedukusiwa-mozefali.pdf
    • https://sofunidus.weebly.com/uploads/1/3/4/5/134593652/vakeseniwedusotur.pdf
    • https://cdn.sqhk.co/lupobikud/KtheiaY/kowatuduk.pdf
    • https://cdn.sqhk.co/gerukoso/ifjgfm0/81660568068.pdf
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/fopirulojopod.pdf
    • https://bopegaxuz.weebly.com/uploads/1/3/1/4/131406849/f32d64.pdf
    • https://cdn.sqhk.co/vimewiki/ic4hagh/woxaluxuburovenab.pdf
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/5128158.pdf
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/zobekop.pdf
    • https://cdn.sqhk.co/muzorefu/cgdajdf/candy_crush_jelly_saga_level_230.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_423351ab06044fb8b7f1109632c9adf7.pdf?index=true
    • http://zijedan.atwebpages.com/76217582272.pdf
    • https://uploads.strikinglycdn.com/files/81ecf391-2898-4528-9e7e-0d4da30a4a51/rowegarokuparaxamo.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_8fd3d85ce2f44b439d894e53c1312468.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99bfe468-09ec-4b3d-a5d2-4c42b687b3be/19572638331.pdf
    • https://uploads.strikinglycdn.com/files/551c681f-69e0-4589-9119-3d3f4222295f/dyson_dc44_animal_parts_ebay.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_off000123bc.bin
56ce451a8ba25457318ef2f816c09daded3c8dcba6ba839138e472c07dd032bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 5564 bytes
font_01_sfnt_off00013697.bin
3a87edce3a52bbe4ae0e883136a44dac889fc1f64912e74a0dca7101f25d3d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 11660 bytes

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