Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbf88d04a8dc461…

MALICIOUS

PDF

73.6 KB Created: 2021-03-20 14:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d88f08001d57ab5cfb89c393cc14eaae SHA-1: 602a317146a8ae2e75378b004afe24734517e09c SHA-256: ecbf88d04a8dc461c28b4ee99961528db03013585c7a5093ce58e74f65728289
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'jottigo.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily corrupted, contains text related to 'National Geographic' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of a malicious URI and the detection signature strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/award?keyword=national+geographic+en+espa%25C3%25B1ol+enero+2020+pdf
    • http://mexawolin.medianewsonline.com/the_a._b._c._murders_agatha_christie.pdf
    • http://varistop.site/jagurejevz5jch.pdf
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/perawazatozulul.pdf
    • http://damewonuseba.sportsontheweb.net/bulgarian_language_course.pdf
    • http://vuwefedope.sportsontheweb.net/pure_data_tutorial.pdf
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/9667293.pdf
    • http://shoop-fe.ru/cissp_study_guide_shon_harris_free_download37psj.pdf
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/pavaji_jixeza.pdf
    • http://gojawufeki.getenjoyment.net/textbook_of_diagnostic_microbiology_5th_edition_free_download.pdf
    • http://helplnstagram-confirm.com/rupuwejimidavinemafugkpder.pdf
    • http://kirudikegopoded.sportsontheweb.net/zixomowufel.pdf
    • http://creditscoreusa.info/5892282153zemmy.pdf
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/lutikutawuxifi.pdf
    • http://ns.adobe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuxefunuzire.atwebpages.com/38783478384.pdf
    • https://s3.amazonaws.com/sojuravewi/sogexovutuberokogakapev.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/96890872533.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_f29d29a4a96e4191a0445a1285726096.pdf?index=true
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_e9143bb44ece4a1b95b80df97b8f1733.pdf?index=true
    • https://s3.amazonaws.com/mozirolinitaje/ascii_full_form_in_computer.pdf
    • http://kisalonokexiwi.atwebpages.com/navy_prt_bike_standards.pdf
    • https://s3.amazonaws.com/kosipefojaw/earth_s_tilt_worksheet.pdf
    • http://nimanexobubibub.onlinewebshop.net/spyder_xtra_paintball_gun_o_ring_kit.pdf
    • https://s3.amazonaws.com/rumezo/cisco_6509_e_datasheet.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc36.bin
60b6cc3b3c17a4beb8f7113aa490ffcf8d05ee0988a7461ad9a3fd1fcdd6ce63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 5872 bytes
font_01_sfnt_off0000eff2.bin
824f55606d1e76a5cbb5c6663c0b6fb5f8b583716ffe9bda453883964f1b2b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 12344 bytes

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