Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9540fa45f7830be…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 03:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e46ab960f93c1d9b0439249d032d1d6 SHA-1: ca91a904841f894ff564a38c4f9b9ad0ccd631b6 SHA-256: d9540fa45f7830be90a8f1ec122bd1f5d86bfdba9a3b840dc37d764a7e0a5880
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to an SEO redirector. The primary URL identified, https://jacksth.ru/123?utm_term=jessore+board+ssc+result+2019+marksheet, is flagged as a potential phishing attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=jessore+board+ssc+result+2019+marksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368978/normal_601929f688e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_6047e0d55a3fb.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/bijJjjK/bike_race_free_game_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_6041aba18d7e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fc60c4ad7ca1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5ffa86759951c.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/cJJMjjO/understand_home_electrical_wiring.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5fef9db95fb64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_604e626bc0506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_602cf4c2b9f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_602f5f9caa271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_601f40cf086f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satuwegalenez.epizy.com/xofokijavonolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea07f40f-ecb0-4361-83ba-2361d625b06b/white_rodgers_digital_heat_pump_thermostat_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e453cc11-5d8a-479d-9392-b9772709f28f/how_many_points_scrabble_use_all_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9256873-d333-49a3-9301-3a2dc86a7a47/where_can_i_learn_parkour.pdfIn PDF document text
    • http://sudogirelokuf.epizy.com/27546353.pdfIn PDF document text
    • http://lilisav.epizy.com/beresheet_mitzpe_ramon_isrotel_negev.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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 5856 bytes
SHA-256: a9a8c0f80ba9acebe547c0c0329aaec671ba383b490220c08692a6f6fafdbd09
font_01_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 11352 bytes
SHA-256: 2714f8a4cf0146f2c59d5df35998985e0ab03d180ad56ccb14cc6fc4bf401700

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