Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9bae9c8bfc1a47…

MALICIOUS

PDF

75.3 KB Created: 2021-01-12 01:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 899af660391864d500bd227fa783e815 SHA-1: 40f21e8c7b2f167e9b29adebd48daf55d0f6ecbd SHA-256: 3c9bae9c8bfc1a47acca119dac880509f487bf099a926c2c4e98925617d475ce
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, flagged as a malicious redirector and link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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
  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=indian+national+anthem+song++now In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f88a7c1f3f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fa0a4e3f1bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_5fbe5f846c6af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5ff7d313ad55b.pdfIn PDF document text
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/gejigek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fa8b78bb9961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_5f9cd11f44ba4.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/TihiicM/wafileg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5fa884a8b06c9.pdfIn PDF document text
    • https://site-1227526.mozfiles.com/files/1227526/suxigubiveme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fee9af078f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fc23a672044c.pdfIn PDF document text
    • https://site-1083549.mozfiles.com/files/1083549/atomic_radius_and_ionization_energy_worksheet_answers.pdfIn PDF document text
    • https://site-1200115.mozfiles.com/files/1200115/mindshift_gear_backlight_18l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fad524f191b5.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 4960 bytes
SHA-256: 7be1078396d1d752acc3ba83355c88cfda5a5240edb0a2f6aa66969b24fb9756
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 11428 bytes
SHA-256: 82c4daf69979ff50d8f21d37084d6290fbbb8f8f7e0717eec319a61a5c3be753
font_02_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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