Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf0c1e799888933…

MALICIOUS

PDF

72.7 KB Created: 2021-03-30 20:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8335d12aa64e6b5dd0a0b9213a38f034 SHA-1: 8b8c2ac141b3803911008ad8cbad33230a70313d SHA-256: dcf0c1e7998889333f3be34ad99f3dc5a24001da2e560feac9463bab9678420c
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 0.9992

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://nipisod.ru/award?keyword=cefazolin+davis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5ff6a40b213de.pdfIn PDF document text
    • https://gigijegijozi.weebly.com/uploads/1/3/4/4/134400985/8762581.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/pusudevetot-fapatajuk-jesenabijevok-xebupajemuxij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365555/normal_5ffa1840c44b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_600712b069b26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fec68623ca0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5ff42fbcbb04e.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/duvewefexowitatowusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469351/normal_600375003a2b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5ff24fe169a90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5fdfa49c770ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476437/normal_6046395740cf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5ffe78cbcfc99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5feefd773d8e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367911/normal_5fe4d30126eb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_6002e735ec23e.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/goxidovot_vuzebilax.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/pulawujoti-wamuzebolegodif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_6f236ad9746847d3a4ea92fbc47827c1.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_07426712cfa6444c82a4f33cad0e88fe.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_1b6dc80faa6849e3baa83ba636ded00e.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_f0058ebf784d45bcad0368029768f5ff.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_f23b978f3ed84130a9b5838129b1caaa.pdf?index=trueIn 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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 4952 bytes
SHA-256: f65b7e6c691428e54e9575fff160829c4bc2d80e658fda1641389fc247d00e48
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 12424 bytes
SHA-256: bbc310678e267a17f1bdaf793fefaa83ae76f198a74744288d5dbe068aca72e9

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