Malicious PDF — malware analysis report

Static analysis result for SHA-256 523dd72981add45c…

MALICIOUS

PDF

66.5 KB Created: 2021-02-28 08:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 00e7baacd3e44b19dac48cd33c86e886 SHA-1: 56e60eff8e6a40663b76db2f0a61c5d1354e1211 SHA-256: 523dd72981add45cb0dad2f14bee6e8011552487069e318e69ea9f74e8b7c642
134 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URIs and the 'SEO Link Farm' heuristic indicate a campaign to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/award?keyword=past+continuous+exercise+perfect+english+grammar PDF link annotation
    • https://cdn.sqhk.co/jebixusugak/CghEoVi/the_very_best_of_the_eagles_album_cover.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/6838481.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/eyLiiie/fill_in_3d_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/panajevem/bjegf3h/94331872130.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/bjf4ige/67022617814.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/gsm_smart_alarm_system_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/jehcFii/gang_clash_mod_apk_1._0._6.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/jutubupinunofe.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/sonejawugowijipet.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/jegoraxelotof_soxox_nawaxibe_rawemivaj.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/yjiw6hc/war_commander_wiki_destroyer.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/7b1ed92aa1a89f9.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/igrhddO/19069619189.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/c49JEQF/weather_radar_pro_live_maps_alerts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipanigiwulaj.epizy.com/85528878647.pdfIn PDF document text
    • http://lofenabowebezuk.epizy.com/first_grade_homework_free.pdfIn PDF document text
    • http://pelubameta.epizy.com/23874666847.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_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 5496 bytes
SHA-256: 96fe8dcfd908947773a19099d3b8e8504a9dc2f10624cadad6f0a4fabb047b2f
font_01_sfnt_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 9792 bytes
SHA-256: 8c6b6369dca0b96b760487f5e3f135c0c4901aa23e14b28bcb61f33a0066dbeb

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