Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c0e0806f3c4d4e…

MALICIOUS

PDF

70.4 KB Created: 2021-04-04 02:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2121078ad9f4423a804a59f5ca9f51f8 SHA-1: f0076faf972518fd26c7b7b190462093494654e4 SHA-256: 81c0e0806f3c4d4eb663299ec0662085575c1b13d652af29aa434261fa42bd5d
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'midufefew.ru', which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to educational content.

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://midufefew.ru/wix?keyword=electron+configuration+of+ions+worksheet PDF link annotation
    • http://inostrana.com/gijagivofonuxiz9ryqh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377656/normal_5fc6de7b1cc7c.pdfIn PDF document text
    • http://ogranicbio.space/gan_cfoprz5dx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387573/normal_5ff3b1a95867a.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/learning_english_books_for_adults.pdfIn PDF document text
    • http://idealslimitalia-official.site/damage_report_formjt0ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://genolewedusu.myartsonline.com/57008664934.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/46472480137.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/bronkopneumonia_adalah.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/tonumimijonimorejazetejan.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/78529216288.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/90255652786.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/33614869807.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/how_to_learn_autocad_for_mechanical_engineering.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/markovnikov_rule_mechanism.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/tikenirikusan.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/14512135569.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/vemenodojinuke.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/roomba_690_flashing_red_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/zikemamop.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/how_to_turn_on_bosch_800_series_dishwasher.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/wanan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 5136 bytes
SHA-256: 968e2bf86868a98d31a7b0955f0173c02337715cd00438bccfe9e86ffa0b62ad
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10244 bytes
SHA-256: f5700c753f6377acda7a18d9a7a16ef12d59914cd76be6c3022a5fac7145243b
font_02_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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