Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b29854f5bc6b7e…

MALICIOUS

PDF

72.3 KB Created: 2021-02-06 13:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4768c6d6e920d6374722d5b7a44a9f62 SHA-1: 961bcf1ce8bcfaa7f1139be237106c4bdbd738ee SHA-256: 72b29854f5bc6b7ea515eea4c1adb99607ce187fb5e42a387e3c06cfedc693bb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/aws?utm_term=gadfly+suite+romance+sheet+music PDF link annotation
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/jejugagozabutixax.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/2Zjfdcm/minajovofefudop.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/Lhbhgje/hearthstone_duels_decks_mage.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/9e9701907808.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/hghiCFb/horlicks_cardia_plus_health_and_nutrition_drink.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/hhcihTC/67116639516.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/DgGpgiC/soxezik.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/hgfggqF/rujibafovuwadoluto.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/ibsBOge/9692977099.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/fcc8de4.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hMEnzuz/parkway_poboys_new_orleans.pdfIn PDF document text
    • https://cdn.sqhk.co/baxalelizop/Bighhic/37053109747.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/xarovoxalegatopebos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/carrier_command_gaea_mission.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 5276 bytes
SHA-256: c22c6fdb288e0182360f4e54f83a03c6c35d6ae93e3d555f0676230ab3c3bd4f
font_01_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 11324 bytes
SHA-256: 7cc32c9afb921e44486ffedd52fc14d7570f3fa18b111215f048b9184f89fd9e
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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