Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f70d6bdc24dca37…

MALICIOUS

PDF

66.1 KB Created: 2020-12-16 17:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4c738704b06fde05f73d5d4cdca9465d SHA-1: 9caf3d6f3c9f27c18534b185f618e1df7916c38d SHA-256: 3f70d6bdc24dca377a2a07f44dcbfae33b33e4948e29d14d2a1db1080716c4db
154 Risk Score

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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=denon+avr-s640h+firmware In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fa8cc839116a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5fae12b7f3e0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5fcc68415f351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5fb413f965191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5fa46accc518b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_5fafb53499f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f9b8b0c644ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/lefovobibujogubi.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/mapepesoke.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/jafofugab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0586f871-e893-48aa-8c38-e009a60c2b35/luwepeluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2ab066-b7ef-47a6-8167-5a1ff49deaf5/friar_lawrence_quotes_to_blame.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/barcelona_vs_sevilla_4-_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/64917801318.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_off0000c4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E7 5544 bytes
SHA-256: 62720fdb3e021103995b53b5087c0fe1efa7d4d1d3b0b691882ba18dc8ba9a86
font_01_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 10596 bytes
SHA-256: c6fa27fdbb62ae8d3586a9e98e7d5d3ea1b64e17997011a2c043a351f900b215