Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4e252e0a315a9c…

MALICIOUS

PDF

84.3 KB Created: 2021-03-24 12:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 61a6accd4402715cf720e5299ad5ae4e SHA-1: 2ea8080c41cecec8430641a2e9b71bade920fa68 SHA-256: ec4e252e0a315a9c21f9feae998ec141032af958bca47d6c63026db64a0e9d55
164 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, specifically employing a link farm to direct users to various PDF downloads. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute or mask malicious content. The presence of external URIs and the ML classifier's high confidence score further support this assessment. While no scripts were directly extracted, the overall structure and the nature of the links point towards a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/wix?keyword=cured+81+natural+cures+pdf+download PDF link annotation
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/5323447.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/tibOiaY/appsc_dao_previous_papers.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/O8bciaT/living_on_my_own_song_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/bjanhit/block_story_unlimited_diamonds_pc.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/1142835.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/zjckhdb/counter_terrorist_gun_shooting_game_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kixalixu/Ulih1ih/superheroes_bus_racing_games.pdfIn PDF document text
    • https://jenisevemib.weebly.com/uploads/1/3/1/0/131070602/maxotewozifidetugolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5ff5530baeff9.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/jacggWC/vexizexuze.pdfIn PDF document text
    • https://pepexelizuruxu.weebly.com/uploads/1/3/4/6/134656498/boxusiwuloz.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/g5Vhjgh/linear_absorption_coefficient_equation.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/gdgjigx/gijupipevudopubasovugeli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fd087b8860bb.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/ThaJSij/22007149913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7482199c-4860-41db-9b2f-e35b51030c85/yamas_y_niyamas_la_tica_del_yoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b4b360-302c-4674-a8ed-146d5e9af607/41737091232.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_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 5392 bytes
SHA-256: 650ee450e7081de9c5247010147f69a143f2bc3a55717cb0d5dde47a3d6164ff
font_01_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 11616 bytes
SHA-256: 80b384310d319f6a01b4368a9e6df413086258e34b89f9bdc0bb0f86bb7d9872

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