Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef76a65243de66fb…

MALICIOUS

PDF

82.1 KB Created: 2021-04-07 22:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77e2f076227b05d8a08568e6ddef0e58 SHA-1: 6223eaabdd2883f297bacb7910b30c3407da08c8 SHA-256: ef76a65243de66fb68f045d805326a3d42cf51b9235bd0a9ec224ef7c18ff8d1
116 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, suggesting the document's content is designed to prompt a user to make a phone call. The embedded URL points to a domain associated with malicious activity, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=planet+fitness+contract+length
    • https://cdn.sqhk.co/dabozijide/ihaijVx/76552563365.pdf
    • http://kemutedetabu.scienceontheweb.net/synonyms_and_antonyms_quiz.pdf
    • https://cdn.sqhk.co/vitimosugu/hUoheid/fireman_derek_s_delivery.pdf
    • http://wigomufeze.22web.org/kunemasojopikuzobus.pdf
    • http://lakituman.iblogger.org/karusirumamavebudumu.pdf
    • http://zovofuti.mygamesonline.org/beginner_esl_reading_comprehension_worksheets.pdf
    • http://liberum.sportsontheweb.net/sistema_circulatorio_anatomia.pdf
    • http://molefomisapeput.mypressonline.com/75342004049.pdf
    • http://tejowigasinafu.getenjoyment.net/helicobacter_pylori_tratamiento_antibiotico.pdf
    • https://cdn.sqhk.co/tujarazimok/jcjhib2/go_live_facebook_groups.pdf
    • http://zaxabumojex.iblogger.org/zerojinadalixozupir.pdf
    • https://cdn.sqhk.co/xovikojux/23yibdG/ricetta_omelette_salate_prosciutto_e_formaggio.pdf
    • http://sawemawe.mywebcommunity.org/modern_approaches_to_teaching_grammar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://losoxapo.epizy.com/88027534478.pdf
    • https://uploads.strikinglycdn.com/files/88cab0e1-4525-4504-879b-3dbf700bb82a/54296110508.pdf
    • https://s3.amazonaws.com/rizoli/folipan.pdf
    • https://s3.amazonaws.com/vebogotexaf/work_flow_process_chart_template.pdf
    • https://s3.amazonaws.com/nedijowewoded/chinese_chess_xiangqi_pro_2018_apk.pdf
    • https://s3.amazonaws.com/figidireki/ashampoo_snap_7_crack.pdf
    • http://sowutafamewuben.rf.gd/13954427954.pdf
    • https://uploads.strikinglycdn.com/files/9213f379-126c-49b8-b1f3-cf1bdf10d356/wokemunajeburikoxenud.pdf
    • https://s3.amazonaws.com/firudegix/roxadiroduxefe.pdf
    • https://uploads.strikinglycdn.com/files/237b808d-af4e-4ffe-a0a1-52e96e980678/23999829247.pdf
    • https://uploads.strikinglycdn.com/files/c27fb5f8-9417-41d7-919b-3accddbdc947/63420786651.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_off00010402.bin
a914c4c5d5e3d54e6d01355c8ebd36bd365c9e2927c155d78f26fea768067685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 5144 bytes
font_01_sfnt_off0001157f.bin
5430dba27f5c803770697744e3e03897136acbded72de75db6bdafe4748cf2c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 10900 bytes

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