Malicious PDF — malware analysis report

Static analysis result for SHA-256 958014c17c278f88…

MALICIOUS

PDF

77.1 KB Created: 2020-12-28 21:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9b7c9421c6de74349a5a485d7442cc5d SHA-1: 76fb654f218f95caba94d4200e2dc80c64d38126 SHA-256: 958014c17c278f8816c145d8f014c082bcc5620911a54893e5d0b1ebf3e22679
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://trafffe.ru/aws?utm_term=calculus+cheat+sheet+pdf', suggests a lure related to 'calculus cheat sheet pdf'. The presence of ClamAV and ML detection, along with the PDF_SEO_LINK_FARM heuristic, strongly indicates malicious intent, likely phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=calculus+cheat+sheet+pdf PDF link annotation
    • https://pizewenijanud.weebly.com/uploads/1/3/0/7/130775868/mutikatixajij.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/hiaohgm/xatozifinidanupegatozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f999757809d7.pdfIn PDF document text
    • https://fijateri.weebly.com/uploads/1/3/4/3/134371572/rozuxig-vifuwitisuju-kinapiworulu-libikefinaz.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/11b26d29-36c9-4e04-bf0e-c16f6aadc1b5/99942624577.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/oil_circuit_breaker.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/lixusewuvagagamasev.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/manual_del_ministro_funeral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdbe097-111b-4d77-b244-89b4df3d792f/ebay_fortnite_accounts_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a908438-4483-4e1d-a015-dbe98340d9a2/renalitasefomotuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/16026901434.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 5052 bytes
SHA-256: ea3675f3d893e53aba90aea00447659d156f2a31cb6daf68ee4cc826a6ce8964
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 11440 bytes
SHA-256: 40b9e10422730b6ab1c4868c88daed6821aa6a3a36cdf63c7a086fd0fd9a58da

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