Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6409cd4134283a2…

MALICIOUS

PDF

63.6 KB Created: 2020-12-18 03:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b9b1d7b4dfa4f80f94cd7f5592a3e956 SHA-1: 19c82aa1872fe8c12ca30579c45380ac26c4d27b SHA-256: a6409cd4134283a2bf54fc8b93054d3a59dca224b4b57ad671a5b85a6e960159
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://traffset.ru/strik?utm_term=vietnamese+singles+in+houston PDF link annotation
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/2a12ce8.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/028a5c9d5aa.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/05bde.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/7a97f940-fc3e-4093-93be-9ea851203a06/36552802814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdd2baa-3adf-4be1-8463-af67e2b64371/pabisof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e201f8-b826-41a2-a78c-1e61e1ddc7bd/angle_of_depression_definition_geometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eda6005-cc02-4ccd-8aba-544192eda421/blown_to_bits_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a98d1f5-6ddd-4d09-8a79-bcce6ca7a2b6/ge_potscrubber_600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d952382-7dee-44a8-8fa3-23521e461d0a/eastside_baptist_church_east_cobb_marietta_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e9fbb66-516b-4171-a2c0-c21710c3a338/453474018.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/pomogelora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5224ad-3c7e-41af-ab29-63b176558f48/tronical_tune_user_manual.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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 4968 bytes
SHA-256: 98ae1c114ad0c68960d40a68762226711b42c85c755811ee2d851afb30b6af4e
font_01_sfnt_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 10436 bytes
SHA-256: 16b095d7ae40386c9704474ed2b25977176c6d06c17499d5ef3825311d753575

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