Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac82cfb560576e97…

MALICIOUS

PDF

85.5 KB Created: 2021-03-28 14:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d5d926125ba0fafadd14b9677424b4d6 SHA-1: a91fe75851c3ecc8c684f4bb3233ebfe4ff17a45 SHA-256: ac82cfb560576e970dff79044d2200e66a8cd290419a89cd7fcf11014a7dfdc7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute further malicious content. The primary URL, 'https://resalured.ru/award?keyword=pdf+file+viewer+app+download', indicates a lure to download a PDF viewer, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/award?keyword=pdf+file+viewer+app+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426416/normal_60485cff34b5a.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/a67efc.pdfIn PDF document text
    • http://teaitalis.space/lasupa787bo.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/e_marketing_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402721/normal_5ff7e84ea76f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_60469cbd37091.pdfIn PDF document text
    • http://desararixiwikos.22web.org/80139547365.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/poligikodinovux-gekowi-potowubadonore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_600fd68ea99c6.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/32423912406.pdfIn PDF document text
    • http://storeplus.pro/lenupaxadopisuninulezewus86lw0.pdfIn PDF document text
    • https://malafusid.weebly.com/uploads/1/3/2/8/132815748/gogirosopateg.pdfIn PDF document text
    • http://richteam.site/bartletts_familiar_quotations_18th_editione4lxk.pdfIn PDF document text
    • http://mini-cam1.club/how_to_reboot_kindle_3rd_generationy5hao.pdfIn PDF document text
    • http://kukushpa.fun/rufuzamofoda6ne8l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_ed0e9cd461a648cb96d240dde6b29b77.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_df27b674087b4f41847f9a9e76639ac7.pdf?index=trueIn PDF document text
    • http://sosujogi.epizy.com/pafigunitesexoxibez.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_54cfec809ae54b60aab5d2fb342eef69.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_787a72cd1b184aec81993fa63e568b2f.pdf?index=trueIn PDF document text
    • http://nisoruv.rf.gd/ben_10_protector_of_earth_cheats_android.pdfIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_2d7218f130e540beaec70e79b1b7a223.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_f762cba452a84ff8b5fd774250e78ac4.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_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 5012 bytes
SHA-256: 58afb4dd24de33d727c974836f652f17ce461484393120299519decba950b855
font_01_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 10788 bytes
SHA-256: 4289ffd1ca04e3d6a43abf040c34a59c1e5d98a87b83bc3367b98dc912c1939a