Malicious PDF — malware analysis report

Static analysis result for SHA-256 156a00befdae3d97…

MALICIOUS

PDF

74.8 KB Created: 2021-02-15 13:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ced88517c320a378c7baf620b740fdf7 SHA-1: 09987775ed00457c1249aaacbcd7a9ac6e1c55f3 SHA-256: 156a00befdae3d97c6c20fb63fc0d9f5b77830ca5507fcdeb03f6b7c5e3f0a00
156 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 generated in a link farm pattern, suggesting a malicious intent to direct users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://maypoin.ru/strik?utm_term=is+there+going+to+be+a+warrior+cats+movie+2020 PDF link annotation
    • https://fokurojisek.weebly.com/uploads/1/3/1/4/131438639/1ca6117.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/djhMJib/sap_netweaver_portal_interview_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_5ff38f2e678a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_601853be972fd.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/5o5hjjg/make_fabric_face_mask_at_home_diy_youtube.pdfIn PDF document text
    • https://kabuzelegogem.weebly.com/uploads/1/3/1/4/131453274/tuzikorex_xejurafoteba.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/ronibod.pdfIn PDF document text
    • https://davijune.weebly.com/uploads/1/3/5/3/135315517/vezurolisibelamo.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/28fhgju/valeton_rushead_max_pocket_guitar_amp.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/ied5hbF/bibejawevovad.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/telasebisu/calendar_template_august_2019_word.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/betinget_formatering_excel_hvis.pdfIn PDF document text
    • http://potunivezu.epizy.com/luxury_sofa_3d_model_free.pdfIn PDF document text
    • http://pawegafed.rf.gd/dialog_box_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/78498097849.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/gabrielle_aplin_my_mistake.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/sample_answer_sheet_of_writing_task_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/htc_android_9_update_list.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/83004431995.pdfIn PDF document text
    • http://gusozafameximi.epizy.com/lumineers_ophelia_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/angry_birds_2_apk_mod_hack.pdfIn PDF document text
    • http://meguwuzib.rf.gd/92586043638.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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 5684 bytes
SHA-256: 2d4a6c53761d289caadb4363a6f685126bb8f1f7bf3966e324aaf1156c390850
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10824 bytes
SHA-256: ab668719e4bf9d496239269b08c5599cb1ff6d61a4e02d9dcea7d9985ddb703c

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