Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4099a3771a2ab5…

MALICIOUS

PDF

66.4 KB Created: 2021-02-21 06:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 991ecba9cea3a5d805c91b0d333e6800 SHA-1: 4cff8da64cb8d5809889b4d1758391867b2ab973 SHA-256: af4099a3771a2ab54d0a1fd39d3bf0002b83baa9f4df1407fbd8b43f7b5d7440
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL `https://seumenha.ru/wix?keyword=download+castle+clash+mod+apk+android+1` suggests a lure for downloading a modified application, likely to compromise the user's device. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=download+castle+clash+mod+apk+android+1 PDF link annotation
    • http://mebelintera.ru/lung_cancer_guidelines_chest45wkn.pdfIn PDF document text
    • http://ipai.online/mejor_antivirus_android_gratis_2017yvb5g.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/e22henY/stack_it_peg_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_600a083a9fd05.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/ghLgNG0/magic_fluids_free_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475582/normal_5ff7ff8364f44.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/sebunuzu/forster_fire_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/bpsc_ae_syllabus_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/komimedefutod.pdfIn PDF document text
    • http://tipixerokofor.epizy.com/repair_mov_tool_free.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_off0000c6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BD 5520 bytes
SHA-256: c85363e86152d197418ab1dbaa5cafd8bf729dd0bc4161d7d24cef58f3f190fa
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 10412 bytes
SHA-256: e4df6b23fcda96f621b57c8bc927ea72a522c567386ba84bd1cc02673e66a67b

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