Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d76e821e8d1eb1…

MALICIOUS

PDF

87.0 KB Created: 2021-05-03 21:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ce9459cb8601b1a6a94dc4a3898fd8b4 SHA-1: 19173b692458d56667d8720acba4d7ab3bde47c1 SHA-256: 11d76e821e8d1eb1766321ea90e11fd1d749b309f32f39595175ce636a0fd38f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://vilenefex.ru/strik?utm_term=best+gre+test+prep+book+2019 PDF link annotation
    • http://buxuzexutotuf.22web.org/activity_on_arrow_diagram_template.pdfIn PDF document text
    • http://natorg.fun/fezikumagixosevtrrvc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fdaaaf43d482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_602e09126b121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_602aaf5baa48c.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/ak8Hhcf/71862989937.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/6195605611.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/1gjjahi/94217704513.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/jjidhb5/battle_royale_simulator_mod_apk_revdl.pdfIn PDF document text
    • http://mibotirekusiw.mywebcommunity.org/complete_calvin_and_hobbes_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/j7hbhgk/vector_graphing_calculator_2d.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/fundamentals_of_arm_wrestling.pdfIn PDF document text
    • http://bitunowaluf.sportsontheweb.net/59411734217.pdfIn PDF document text
    • http://nikaold.site/where_is_sydney_in_australia_mapoebou.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ghAlryb/the_muffin_man_lyrics_ella_fitzgerald.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fe903a59208f.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
    • http://jizoxofude.rf.gd/surfboard_sb6141_issues.pdfIn PDF document text
    • http://xetobagog.rf.gd/17830432394.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/wojixaxibudiluzilonuviduk.pdfIn PDF document text
    • http://sumabaxesopev.rf.gd/methyl_orange_dye.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_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 5116 bytes
SHA-256: 54a9a18780581fe7ca2ceef514bfc6413105ad24381e9bb8c5a4b5f3dd751f24
font_01_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 11004 bytes
SHA-256: 1f01728b59c4c0a61edf42c56f876a3dbe70f10bf5e0f341b122a25e6adb767e
font_02_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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