Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ad99eed9a87e7f…

MALICIOUS

PDF

65.0 KB Created: 2020-11-14 12:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ae9cd34715c60397517da0934b39979e SHA-1: 9d9d39d7406099048ce2b8e30791c4dd81131d57 SHA-256: 17ad99eed9a87e7fa706114a30bad4cd491d8169f36008cda68d699ed2d792b8
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=el+examen+escrito+para+la+licencia PDF link annotation
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/692b15.pdfIn PDF document text
    • https://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/b7463.pdfIn PDF document text
    • https://tufobedix.weebly.com/uploads/1/3/4/4/134431979/watalogirutaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f88c827ecbab.pdfIn PDF document text
    • https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/dajop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_5f988ec3e6bfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xovajukoxin/pc_apk_download_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/36940704498.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/tozejafokilopinilisefofo.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/paboletanuwuseju.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/corduroy_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/zesiberad.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/earn_to_die_6_hacked_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/18387436476.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/wowajatokoniso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 4892 bytes
SHA-256: d5f39a4bd06be3fb55d0ab7ce164a1a4a73b8977b449ca261efccc83286e9473
font_01_sfnt_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 10764 bytes
SHA-256: f5fb6fd0682cf9e8edbb003bebe92a7de1f55b05ec5330cbbefcb806e26fe4f0
font_02_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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