Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a45d8ec7991d0b…

MALICIOUS

PDF

73.2 KB Created: 2021-02-23 22:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20377bcdc441b4de239b92f827694cf6 SHA-1: 8d063573b50590af4a46bf2b2d60a396dce290b5 SHA-256: 59a45d8ec7991d0ba8967ec7d374ea4f54e4ac4a6e93f6527869e78835d72384
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/wix?keyword=videoder+video+downloader+apk+file PDF link annotation
    • https://cdn.sqhk.co/baxorurifina/XH5jfMB/bee_factory_game_magic_hive.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/ifZgUUL/befenu.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/a5ibTgg/dozutigasixinezaruzadega.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/jjgiPjf/xiten.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/Uazkjhb/kavata.pdfIn PDF document text
    • http://pusaburuku.22web.org/amiad_filter_saf_3000_manual.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/7476063.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ejhics5/online_video_downloader_chrome_extension_2020.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/miledu/liwakonanoxawopirowu.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/bruce_lee_video_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/bharatiya_janata_party_formation.pdfIn PDF document text
    • http://nupusadulawux.epizy.com/volume_of_a_sphere_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/rawafinumofepukurepupigez.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/line_symmetry_worksheet_gcse.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/bozedidilewipugizirevof.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_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 5036 bytes
SHA-256: aaee06972820921a74a1493ba698ef2e29a67cde216a2f3e778847bc37ff42e6
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 9928 bytes
SHA-256: ac431090f862bd731c0457b99e6b703c790d1fe8a7346ade543483b0d4d65671

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