Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88b3623664fbac6…

MALICIOUS

PDF

77.9 KB Created: 2021-02-15 07:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 58e27c7db9c457a1de9980880750a8f3 SHA-1: fb0650dd8b9b92c60d069e0748abceead0e97752 SHA-256: a88b3623664fbac65882a6bb88bcbcaeada8577f75dce80aac176bc691fff274
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=win+iphone+6', which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=win+iphone+6 In PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/gid1wBz/gakiwajebonuvut.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/dBhdXge/attack_on_titan_eren_voice_actor_japanese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5fcd816ad93c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_5fe152b4644bb.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/6c0gfhj/zetetuvenekesodelawege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_601af5db207ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5ff2bdded1389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_6014e12bed6e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_6029a275dce52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_5fdaf6d7a2fcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366351/normal_5fcbdbda4944b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_6018a4832f0ac.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/gjhggjb/surviv._io_proxy_sites_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6010cd5fbe0e3.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/UeUgig0/10056811838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fcdc76b95941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_6029e16490cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_601dcbcdf04aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_6022649a2fcb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 4556 bytes
SHA-256: 65313becc1f4f741e94db5b613445cb321bdfa5997efb7fc07755b83fca683fa
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 11220 bytes
SHA-256: 80b42bf1d7520e759be21d74e702e00e00cdc78a8ea245221693169acf6fed1c

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