Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fdc3de868af165…

MALICIOUS

PDF

70.5 KB Created: 2020-12-15 05:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 675e018bdf0699fdffc8c319c4470f02 SHA-1: 918bc2126e0e618896cf7fb8001bee7f4197ad7b SHA-256: 04fdc3de868af1655ced512d7d2aa01140511129f173fbd325df5b01df13687b
176 Risk Score
Tags
free-cdn-ebook-manual-lure

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. One prominent URL, 'https://traffking.ru/123?utm_term=que+es+el+matrimonio+para+dios', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://traffking.ru/123?utm_term=que+es+el+matrimonio+para+dios PDF link annotation
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/42ef18.pdfIn PDF document text
    • https://tevutilig.weebly.com/uploads/1/3/4/5/134585367/nisagugefuz.pdfIn PDF document text
    • https://vurifupilubat.weebly.com/uploads/1/3/4/4/134495287/ziguzilap_madawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5fcf611f0f06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fa1f0f960173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_5fba7fdfca6b7.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/94a45f7f-7db9-40f1-8992-554934d42aca/clasificacion_de_los_explosivos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419e44dd-a188-4d20-8501-d7e4474b3656/nokikumas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec42faf-2d8b-4151-9903-c2ff0733e659/pirawug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dddb6c8-1daf-4c13-99cb-f674338a7b10/wie_man_ppige_Gelee_Seife_macht.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7597141f-0752-4937-915e-c80f727b76b2/crestwood_elementary_school_chesterfield_virginia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9bc34c-bfb1-4bab-bacc-0f72d0c93ffd/34443563004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187f6a0e-ccaf-44be-b56f-1faef4e110f6/fifty_shades_darker_online_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e592faf6-6be3-4c56-bbf8-58b613f61319/stihl_chainsaw_owners_manual_free.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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 5164 bytes
SHA-256: c91c5c96055f0a863c05dd8fc5b14610fb8f44aab610eb62390b325b9a974b61
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 11156 bytes
SHA-256: 353be85f88721cef7943c979ac9427aa850b2984fca3d482a60eea1e8a539167

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