Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1092696d54f2b5…

MALICIOUS

PDF

65.9 KB Created: 2020-12-16 13:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 70c3419e96c5e0b143c21c142d9fafec SHA-1: 3bfc293658318ed1c4c54b1060debb60fb95e0bd SHA-256: cb1092696d54f2b59ba491fe2bf44ccd9b9e395e18edbfe39fe8ea03236d405f
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-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://trafffi.ru/strik?utm_term=universal+metal+industries+exhaust+fan+grill PDF link annotation
    • https://kogavoduwesexup.weebly.com/uploads/1/3/4/6/134600755/5756289.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/6841988.pdfIn PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/gozilabej_mefapizexav.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/4508209.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc350c32e537a05ef18a0f9/t/5fc6c49fa038a451bcd76f99/1606861983622/ifly_gps_720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e686cb-3acd-4d07-b1b9-30343af78601/48189812240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8073f12-3cef-4630-85ff-0e1329959301/vedigevozakinotudupaxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67da276-852b-4b7d-91e9-131453f7bb34/desafios_para_el_desarrollo_y_bienestar_colectivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4896aa89-d437-4488-9930-ce4e3c42d154/juvumusokugatodopifawaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980d49fa-d37d-4316-8ccd-26c0663677ac/wigajizodemoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f178dc-5a58-4b42-930e-955e3fc67709/58072821627.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_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 5440 bytes
SHA-256: 2fbce32e3725947ded567c388d9b8c66dcf58a75184158667de608b95f9aea6c
font_01_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 9976 bytes
SHA-256: 8b44d5e4fdcc1dd35c8a76fdbcceb56616a4e0b392144bdfbf3b3330c44f7a2d

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