Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c66bfe2b4b430f…

MALICIOUS

PDF

81.7 KB Created: 2020-12-25 07:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9ffd24dbac7a1f6ba4afdc479ac133a3 SHA-1: 92eb26d92bffad5061eacf8b7fe04e77d8120cb1 SHA-256: 77c66bfe2b4b430f855cd5939c8842a19517a331dd59041bc6a613ad8f945233
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 0.9995

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 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://trafficel.ru/strik?utm_term=tomb+raider+2+movie+2018+sequel PDF link annotation
    • https://fisolaxarod.weebly.com/uploads/1/3/4/4/134471724/suginukixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_5fd9f7be73b1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f8fe358b3f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421330/normal_5fe1b1a546208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5fa1466f6c807.pdfIn PDF document text
    • https://cdn.sqhk.co/podadoxafa/ihOtiii/63233438337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/57759ae2-6eec-45e1-9d92-40b57a369b01/20873751273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecd6ecc-4be4-4e20-9477-92d0e9cc1576/wigakunos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6034225b-2e76-4469-9f6a-1773b3301bf4/23157779074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd37a19a-2cd9-420a-9853-2f261f9ac270/68152565794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8a949c-d077-48ca-844c-c947153aa75a/definition_of_food_guide_pyramid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429f3e3d-4ad3-4aa4-b1a1-5b56766ead6e/cheats_for_word_chef.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 5464 bytes
SHA-256: 7570b51414310eba893065e2bf1bb040e40479b00c65c6c0d82ac0accacf93b8
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10996 bytes
SHA-256: 5550b21c9405d85322333bb7b2b70bdaf58c46079769c71bd43bd780d0781774
font_02_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 16208 bytes
SHA-256: 10c941b8e150654bd5064cadd75ea78825c9277c873182c21e5fbf45442fdeec
font_03_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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