Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587dbaa30c885f9…

MALICIOUS

PDF

83.3 KB Created: 2021-03-16 16:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8793d057bc8fe820e3dd7f0706f99930 SHA-1: 16cc182e2a538f50c27a4f7409d0ea01442354f5 SHA-256: b587dbaa30c885f94e60d8551f0bada120a6a159644ebcac7f0dfc0f5fb59077
66 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 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 0.9995

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/123?utm_term=lmcc+part+2+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402267/normal_60499894292a5.pdfIn PDF document text
    • http://yellownatural.space/zanigixuzizetudufilverx4.pdfIn PDF document text
    • http://salea.site/blood_angels_codex_supplement7phr4.pdfIn PDF document text
    • http://akb54.ru/how_to_connect_directv_remote_to_receiverk56vj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5fd7bbf788720.pdfIn PDF document text
    • http://gratoramaa.space/1270684851712jyk.pdfIn PDF document text
    • http://fastnoutservice.ru/27446980824uwo6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_600b4a64402f6.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/what_is_the_core_message_of_the_quran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_600a7af36d54f.pdfIn PDF document text
    • http://lienforkid.com/milk_and_honey_by_rupi_kaurf4jig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_6049282f9b1ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_e51944ad67b046d0a52bb826590da75d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/best_android_phones_under_6000_4g.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_f87ceaee4d634b92a4c91ba6648d5288.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/kakulexeb.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/mizetegosefufogakaruzuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/77142720271.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/52508848955.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_128a4976bd4f4c8eaa67dbab6cd33023.pdf?index=trueIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/python_gui_programming_cookbook_code.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_e398822fe5844862b3d6b3a751fa50e8.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_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 5536 bytes
SHA-256: 5cb3a4900cbccded7ab7fa11570d52fed69b5931856208b2050ac3f32019482b
font_01_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10888 bytes
SHA-256: 5c91f7493e4dbbac81978dcff24575a31cd9e03393c5c8597739fb2cd954c660

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