Malicious PDF — malware analysis report

Static analysis result for SHA-256 42790454494dda33…

MALICIOUS

PDF

85.9 KB Created: 2020-12-18 05:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b5961b09e1f0985a601ed1ba0e43626f SHA-1: dcb1b79ef1af5e0b15b65153b6b22af95719abf2 SHA-256: 42790454494dda330026450cdc0ca305d3a64eeef92aca1a5cb1728d0ab559f5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://traffine.ru/strik?utm_term=smile+notification+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5fa141571bf09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fcc8aec1a043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f8c42f854ad0.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/38d213089e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fcac95936801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fb29826c3fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fc8b19188a7b.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/fetimufodujaxo-wosofotekujazik-sodufopepoli-lofovabazejuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93ecd3d-6a06-410c-9698-d3038b525d8d/65005952682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c1e42a-d100-4796-a584-23ac1e2d5303/34449941785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1c3029-2501-4478-ba3e-01dffd8a45a1/universal_remote_control_codes_for_onn_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5a80cd-1b85-4864-a018-568833cdb16a/tarzan_lord_of_the_apes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200eedfa-ae05-4c3a-95d7-b358d07c1c8d/20109654400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb6e33c-d328-4d2d-bb09-d07f1d8cf75c/kexadexutadoxikuzupi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/haywyre_insight_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 5284 bytes
SHA-256: a76561bbdfdbf519d78f3773df3c37f27e040e02c1c8d2ea82e7d1043391fb55
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 12544 bytes
SHA-256: a139371570028444e6b17837a06eb4a57aa6828c2b5273f0e107e9a34d980324
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 16152 bytes
SHA-256: 70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e

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