Malicious PDF — malware analysis report

Static analysis result for SHA-256 445ee8ac9dcba998…

MALICIOUS

PDF

72.0 KB Created: 2021-04-09 14:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9aa4fe60e5c49a2549b1bc9efcfdc45 SHA-1: 6d31122ed16b972e55e565bd5dbd9c4b10a7dca0 SHA-256: 445ee8ac9dcba99889de5a554309932dafd59e7160ae45186075e475d886fa7d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to benign-looking PDFs, but also includes a lure to install a browser extension or update. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is https://jacksth.ru/strik, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jacksth.ru/strik?utm_term=what+is+a+career+development+event PDF link annotation
    • https://rodifeganugupi.weebly.com/uploads/1/3/2/8/132815003/1348644.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/0jbhTIa/woodturning_3d_lathe_simulator_wood_woodturning.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jhgxGgv/ninja_run_2_game_play_online.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/8c1eacf25f79.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/g02uadc/kojepowafigorelawogade.pdfIn PDF document text
    • https://ladubikoniku.weebly.com/uploads/1/3/0/9/130969526/2544014.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/3975666.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/ajjjhic/where_to_find_hand_drill_tarkov.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/mujesogi/86759148097.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/devotional_songs_free_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d3c777-af10-4086-802e-682034702ea6/65593017398.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/jamobasugegesed.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/32393649161.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/64905614742.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/box_top_collection_sheets_50_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fa494b-9ce3-451c-9028-d5baee9835fb/fagunajilalinafida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412e45d5-c8bf-4ed6-94a5-9857f8b8ce90/afterglow_headset_ps4_mic_not_working.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 5388 bytes
SHA-256: ffbdb59a628f22990815f2ca855248e468039c8d3c02ca7db129bda5a60b5e03
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10420 bytes
SHA-256: e0935e328e1bffea5086d89bbcea21472b7b329447da1a44896ed6050f010797

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