Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cba31c20ae9558…

MALICIOUS

PDF

70.7 KB Created: 2020-12-22 19:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 870ac083567b19fa05ef04c21331c620 SHA-1: 84f7bb7e89c1f1895771fb120be2c9e38a19c4a4 SHA-256: 61cba31c20ae9558c0a2ba227b841b870b79ea1fc9c1478ddef493e667e7c675
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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/aws?utm_term=special+education+lesson+plan+template PDF link annotation
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/gajazagijorejof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_5fba1814120c2.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/xumupafav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f8d5592db422.pdfIn PDF document text
    • https://kinoxumore.weebly.com/uploads/1/3/4/4/134463035/neziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5fa0f99b99cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5f983bba6e512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5fb89ec599534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5181abe9b69395125e644/t/5fcf68ab505b451de18cb888/1607428268386/blood_pressure_medications_names_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf68eefa8be4403e0ccdbb/t/5fd71268481cfa31addf8661/1607930489049/crystal_reports_format_editor_keep_object_together.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/adverb_clauses_of_concession_exercises.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdd0b8d67c3114891d786f6/1608321935541/aristotle_and_dante_discover_the_secrets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d238ea2-2466-4ecf-a05c-91f780857329/40773653522.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceef468de958422213495e/t/5fcfc689b246a03091eca059/1607452297922/71347624698.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f72c17e7202640041a88/t/5fc65b9ef81c9a2a0c7cddc1/1606835104649/jibugidekijafuxakoxuzopo.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 5224 bytes
SHA-256: 25a6d2e006d81201601cb56c8939e4a079e96a26bcdd27fd70911b27cc0c5ff6
font_01_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 10060 bytes
SHA-256: 28b0fff561d80a93bc6eddaa908351f33379268e1b0f9eab552d9c6989dcbb71

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