Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5702807f7c9c7d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 11:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9bcf6eff7f238295c0e1a73e9c7700 SHA-1: db552a6a3b3ec17ae8232c1cf540a8f9aa3ab33a SHA-256: 1e5702807f7c9c7d1fad61954752c30f6d1ef4471e89df4d46d41e9722205cdd
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or hosting malware. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=data+analysis+introduction+to+statistics+pdf
    • http://copyright-notice-ig.com/jusemizorr104.pdf
    • http://xalenupom.getenjoyment.net/44893127725.pdf
    • http://fevumajugo.iblogger.org/desafowalapijibafojam.pdf
    • http://glasshookahcatering.com/steamers_restaurant_hilton_headxbssv.pdf
    • http://gugibugud.mygamesonline.org/aliens_love_underpants.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jirebonudur/distributed_systems_coursera.pdf
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_e60199c9a1e84cbeac2b4adb5d170b17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47698211-ffd7-41b2-b7b9-07dde281f3ee/52641270673.pdf
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_c7197b395b074c8ba5cc07b53fbe04cc.pdf?index=true
    • https://s3.amazonaws.com/kavalukato/93051791245.pdf
    • http://gugosezufuted.epizy.com/action_verbs_flashcards.pdf
    • https://s3.amazonaws.com/winumigutam/madrid_luxury_shopping_guide.pdf
    • http://tuxabatadifu.onlinewebshop.net/479004623.pdf
    • https://uploads.strikinglycdn.com/files/3ad14495-0e83-4718-b42d-fc1dd6533d8a/mategubesola.pdf
    • https://s3.amazonaws.com/jobavo/memukejobajemirez.pdf
    • https://s3.amazonaws.com/pogolo/lajudut.pdf
    • https://uploads.strikinglycdn.com/files/a934c2e4-b905-49c8-956c-575a0c05e03c/mi_home_security_camera_app_for_windows.pdf
    • https://uploads.strikinglycdn.com/files/99348c4b-e87c-47fc-89e6-505bfe8ec731/salilorobasepis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede8.bin
bde05f446cb7605a20bc46cb1ef5a373449eda6d19a0f13fba5c4774d8135ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 5248 bytes
font_01_sfnt_off0000ffe8.bin
a34bf38dedb2b2305453ae4d6b19ca370112d655120f2052403997481fd46679		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 10456 bytes

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