Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4548943e7681a03…

MALICIOUS

PDF

81.2 KB Created: 2021-04-05 09:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f7e56feda115ce0af9c623d204254af0 SHA-1: 4f0c3b234f8f4caa194648d43773c8692131b788 SHA-256: e4548943e7681a0359d59322df49686139ede5fdf53baef6d3b95c32d411338b
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 0.9998

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
  • 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://dugedepap.ru/strik?utm_term=best+investment+for+2021+philippines PDF link annotation
    • https://tikekukitalil.weebly.com/uploads/1/3/2/7/132712015/671aaf7d655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5fd2ebb8d1814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366382/normal_5fc5a2115060d.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/13221118594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_60262bc751a6a.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/50692690565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_5fd09cbc6b01f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fc78cad2bc4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5ffb0a4610297.pdfIn PDF document text
    • https://tirotirow.weebly.com/uploads/1/3/1/3/131380420/9923030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_603285d0b4d9c.pdfIn PDF document text
    • http://mefurolawexi.iblogger.org/14781950503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_ecdec805f20b4952a98b062066ddfa80.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_8e65b6e96ff742dd994bcedf85ba31ee.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_c90304d65476415e9fbad84481ff9b9a.pdf?index=trueIn PDF document text
    • http://jexalokilefel.rf.gd/microbial_ecology_atlas.pdfIn PDF document text
    • http://wevibek.rf.gd/73957874962.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_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 5364 bytes
SHA-256: c169209006c8571286c1af8114e6e3c2aa0c2ecb7dbdbae3fab5e73cc6366599
font_01_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 10916 bytes
SHA-256: 4d39564e946f6cdc735c6cbc0646f5a07a7d6f9f0f1924d31ad495645f3be33f

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