Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab116288341f61b…

MALICIOUS

PDF

74.3 KB Created: 2021-04-04 19:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aac26ddc8f658c1ef687c480ef673b27 SHA-1: 541200c0d4bef6b82298b01d4fe0326a44df2ae6 SHA-256: cab116288341f61be9cb40a8b1ab16c998ea89eb8d5d143fef7e44ad06715b69
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 0.9997

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://midufefew.ru/aws?utm_term=anatomy+drawing+school+human+animal+comparative+anatomy+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473039/normal_6006eb4dbdc0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6062d0ed3b1e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446914/normal_5ff3efa5e89fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_5fd655d15c941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_6009ca55364c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/gibJMhi/34584265989.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hihjMhg/99646534796.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/hbgcOHN/fomusarivibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/free_decision_making_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/flight_simulator_2019_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/eric_ambler_books.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_7d23edac791a43fe8bd2bfbc35099052.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/mimejekanun.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/17357778914.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_607f010b26f14289847b809fd634b604.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/90684729233.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/why_is_positive_discipline_effective.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/viva_video_stream_tv_online_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/ajax_jquery_form_data_send.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/jitarojuxuzezobamox.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 5812 bytes
SHA-256: 63eea30cee52cef625fc94918c272a817295d149677e2f35368b3ef90524610f
font_01_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10488 bytes
SHA-256: b87df8de08350bcd8f1faa918e945af3d4c87e65ba47b3c6ce8317ddd1916da2

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