Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45350aa23db785d…

MALICIOUS

PDF

89.9 KB Created: 2020-12-07 02:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d8198b2775f3675a5036aedf53c4c8cd SHA-1: c35aa466e528eee0d9cd6a934e14e09e1f6cb577 SHA-256: a45350aa23db785d3f10c7785646d36615f637e3e75d491abe26e82e3d1a17f7
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://trafficel.ru/123?utm_term=linear+equations+word+problems+solver PDF link annotation
    • https://mawepalutolura.weebly.com/uploads/1/3/4/0/134040672/laxalu-jevigar.pdfIn PDF document text
    • https://wafugavewe.weebly.com/uploads/1/3/4/3/134369352/jemavamejogu_sesoda.pdfIn PDF document text
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/3596621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5fc91c1fb2b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_5fb6d2cd121a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fa0ece4590af.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/5fc7991fd32fb7060d12c8d1/t/5fcc187405ddc9599d0fbfba/1607211124726/somujirusumiv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65b470a2757459b08396c/t/5fcc028e2bc7884852a001f8/1607205519477/merchants_bank_cullman_al_157.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51391a8793968642310f4/t/5fc6e59c1d689b68bf8be932/1606870431360/cookie_maker_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4e6e0b-cc79-4f9b-803d-8ea26f09bb2b/dasevepugevas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d4523a-0c3b-4703-8ab1-560636ca6836/gazafotopojojisaxapolipos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57b5ca5bc066edfc4833b/t/5fc88d13094cf7617dc3d67a/1606978842505/can_i_forward_my_iphone_calls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a26e7e4-42af-4786-9800-24600a86d75d/38199085920.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_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 4372 bytes
SHA-256: 290a2e0ea61ad7dc114c8ac5d28af904daf8ba1b2c78f5f3019aba3b40e7f4d8
font_01_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 5464 bytes
SHA-256: 7a97d30bb7c60db4b10249122cdab92bd408efce4b2ed93c7004c8f9ad648c1b
font_02_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 11756 bytes
SHA-256: 704f7205c3f6d342e303fdad14c9b50a2db59da45a270cca2986f5caeedc8733

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