Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f3d36cf7a48c71…

MALICIOUS

PDF

70.4 KB Created: 2021-03-20 06:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b9f6782fd68248ab3f8156764021adab SHA-1: 13e4271e4906d5d30e054d921ed1e997992ef5f9 SHA-256: 65f3d36cf7a48c713792de2b22fd4334b56eec62fa26d7221ae242a3823b228f
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://mezovuduw.ru/wix?keyword=kingman+unified+school+district+bus+schedule PDF link annotation
    • http://evakuator-uga.ru/automating_excel_sheetsm1kt9.pdfIn PDF document text
    • http://alluniversity.fun/xawarubosojotevo2r7s1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_5fd2611f8e389.pdfIn PDF document text
    • http://itawegan.space/how_to_connect_laserjet_m1217nfw_mfplpgnd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_60244cb3583b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_0289c6eeea41445f809942d297e95378.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/windows_10_anniversary_update_offline_installer.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_3cbf38c7853740329eb59e6b410fbac8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusabifef/what_are_some_symbols_of_the_chinese_new_year.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_c1aa7bc6d4124bd080f3f43bb78a300f.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_92bfa032262f4a7d97686f4763193d04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/ffxiv_field_notes_on_dunbar.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/free_basic_genogram_template.pdfIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_a386d8744b4b40c9991b9bae26e78f96.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_1b2692e3ee1c4b67ac74187aaf0d12cf.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_f2a463dff1cb4bbeb42800017328c322.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_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 5544 bytes
SHA-256: 4a79dfa4619360c1858409539a8a1b2890176bd4d0fa656674610949a08636cb
font_01_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 10512 bytes
SHA-256: 2c782da31fc8baee942c125c0b8e170b118fc9b89aaaba79ed00242ea8bbc839

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