Malicious PDF — malware analysis report

Static analysis result for SHA-256 427836cd3f871738…

MALICIOUS

PDF

65.0 KB Created: 2021-02-24 10:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a0720378cd1bf52a3ebabaeade7e5243 SHA-1: fd4d1ea15c14c930e01c2bee1def0d080fa50539 SHA-256: 427836cd3f871738f7aa7620ed4a50bc9ab26147b4c8ec62740aa313f25d101d
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, https://seumenha.ru/wix?keyword=dienes+blocks+addition+worksheets, suggests a phishing or redirection attempt, likely to a site hosting further malicious content or attempting to trick the user. The document body, though heavily obfuscated, contains keywords related to educational worksheets, which is a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=dienes+blocks+addition+worksheets PDF link annotation
    • https://cdn.sqhk.co/nujobuja/RX3TYiz/rapajireparifaluzuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452385/normal_5ffbe55a4c6c0.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/JlFianS/10497876424.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/QHUDSif/98449915155.pdfIn PDF document text
    • https://cdn.sqhk.co/vigibizez/qijXhhf/97068007298.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/ggrjbgi/xafesuxijejejowa.pdfIn PDF document text
    • https://cdn.sqhk.co/zutujodara/8jiLFDG/gopemusineterenep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_601c04715f71e.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/YjjhoOh/how_to_play_chess_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/giV490S/japanese_alphabet_letters_a-_z_english.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/jgifOha/74027454100.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/bvlghib/vavegitunet.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/ihiajb6/23825352756.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/pZvEgid/43677194664.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/kezemiradigu/ramoxanumuludugipazu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/98604039487.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/97550631239.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/guild_wars_2_elementalist_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/85345079344.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/fusonijolan.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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 5324 bytes
SHA-256: 2f56cb17c19ffe31f65463c626b0bd61aec618f8e8394c7574aecac1d6f7e180
font_01_sfnt_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 9984 bytes
SHA-256: 5b5d6a4df4f3e29f5067f7891e1f984607615c06bacc9aa589466d855fe23433

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