Malicious PDF — malware analysis report

Static analysis result for SHA-256 162b61764ceff2d1…

MALICIOUS

PDF

65.2 KB Created: 2020-11-24 01:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7463bc2f8dd8f4c6b43b9c16baa559ee SHA-1: 1d74d75bfcc98b73934d2676bcb4acc2c8d85ec3 SHA-256: 162b61764ceff2d176a7470ab6b9c305740c61497653111b9faf3c4f5e7db50e
164 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. It uses an urgency-based lure. 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 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=organic+chemistry+textbook+mcmurry+8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375086/normal_5f925573b0f7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fa95b2616fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5fb9a57c64fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5fa109ee93391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f87595549635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5f8ddd6e55b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5fa9060284d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_5fa3b4aea81af.pdfIn PDF document text
    • https://jexolelogirif.weebly.com/uploads/1/3/4/9/134901145/xezodanalunulu.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/528ea98b-77d7-4bd8-8e7c-4941e41c00bd/manurhin_mr-35_punch_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab4d108-b92a-4726-ba67-8631c18a168c/jaxobenobojupaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bd1f53-f23c-4ff9-81b2-8ad59d9d96ac/become_a_living_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63291552-d64c-434c-82d8-35f96903ea43/masegilupiduronomub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68da7266-2f1a-4a1d-ac47-3f41ffa78c6c/black_devil_cigarettes_buy_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f096084-a812-4a08-bbfd-373d80e1435d/rosephanye_powell_songs.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_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 5776 bytes
SHA-256: 73e0466ba543289a55d48bd1ed903298754dd44ee676aff59dc2f4db32408457
font_01_sfnt_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 11180 bytes
SHA-256: 7b795a823402a61803c9e4324e468ef3eb445336c316838f296f1e1e87ac5d0c

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