Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80e077ebe28a20e…

MALICIOUS

PDF

80.8 KB Created: 2021-03-23 04:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f5f96a0b06c65e4001b84b697ba3b601 SHA-1: c3a7a40025f1cc9fd5671bf9cabdbda94e3db786 SHA-256: c80e077ebe28a20e79236c687d05d684fe2fbdf7ac3b6f7e6ffd7b1e984fb241
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/123?utm_term=casio+g+shock+5146+manual+espa%25C3%25B1ol PDF link annotation
    • http://leafester.online/225834786565f1k8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5ff89547ca94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_60205150b23c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446029/normal_5ffc802a226ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_604650f10f92b.pdfIn PDF document text
    • http://uscreditreport2021.info/sketchup_pro_free_download_macub2dy.pdfIn PDF document text
    • http://vojidovalo.iblogger.org/mapifuwojusuzukero.pdfIn PDF document text
    • http://giocodigital.fun/dell_precision_m4800_driver_packageatkdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_603f9cfb55352.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/48109b0e-b231-4bcb-b83e-bedc33266ad9/66612028234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021ad85b-1f27-4424-9389-78591b789bbf/tiger_cub_handbook.pdfIn PDF document text
    • http://newiroxupamorik.rf.gd/zeleranifepodiwivogazepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46b7e27-2d42-486a-973f-58d42fdc18ae/nonugowopuleganorafoxegiz.pdfIn PDF document text
    • http://dowirefe.rf.gd/nisisunamunapibanazop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265990a7-fcd4-4659-873f-804196c86fb1/wapigewusanamerajolixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5cdbf7-d27a-4787-ab85-6802ccc6886c/91703515175.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_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 5848 bytes
SHA-256: b3ad638d90cd0654a66417d9b7f229e1bb4365cb718e7675711a767fc1189318
font_01_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 11028 bytes
SHA-256: ce6785a840f424e9af03104caa4981eb0def608a4657c4ebfd365608efdfe436

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