Malicious PDF — malware analysis report

Static analysis result for SHA-256 8529f491bc1bfd3d…

MALICIOUS

PDF

75.4 KB Created: 2021-03-02 09:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 077a9c3505d1bb8a02158b7f1bac5e9a SHA-1: 008e9232efc966d4b4bb3243d5331e343f656662 SHA-256: 8529f491bc1bfd3db03a5535faee7cc27c2b4d913a40bb02f52a070124aaa97d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://maypoin.ru/123?utm_term=wendler+531+bbb+results'. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially malicious or SEO-manipulated content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://maypoin.ru/123?utm_term=wendler+531+bbb+results PDF link annotation
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/8353850.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/7iau2NH/puwafef.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/iJrhd2A/riwixufixitexuguf.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/doNPQXm/complete_vocal_technique_app_download.pdfIn PDF document text
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/5578501.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/apjhaig/paxokiwalewufuridefare.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/EhiMuja/80378703.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/hfibijE/the_longest_game_ever_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wevemugas/Hha7ygf/fekiriwekisipisojidufe.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/dQieIJN/kim_kardashian_game_cheat_ios_2019_no_verification.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/jenkins_dotnet_core_3.1.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/bodajaku/craftsman_6.5_hp_lawn_mower_air_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/85575632783.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/stremio_apk_beta.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/38812483863.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/broadsheet_brunswick_breakfast.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/zedebiwikanuvemu.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/gevav.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/52715969680.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/klasifikasi_daun_binahong.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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5104 bytes
SHA-256: e5db5b6416b4301ae4741915be4df3240546a2f3103da944df31a167d6fa1cc2
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10840 bytes
SHA-256: 849ddbb76ce8b0064e41b6746c54f85ce977b26c19a5655c11984f45257eae88

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