Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1821cdb8579c48…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 20:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 071f3ae01cfc7197de82a1067bc6ec34 SHA-1: 255b4dfccd69b97fa776deae8bac4c1d7dd50700 SHA-256: 5b1821cdb8579c48bc20e280fa3caa4389747f5d79dc198876738d00592253ab
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://nipisod.ru/wix?keyword=kbd+guide+osrs+range', which is likely part of a phishing or credential harvesting scheme. The PDF structure itself does not contain executable scripts, but the presence of the malicious URL is a strong indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=kbd+guide+osrs+range
    • http://bebetadiruj.mywebcommunity.org/melibasowixunumekofup.pdf
    • http://ladirojenovezoj.mygamesonline.org/zubesubabed.pdf
    • https://cdn.sqhk.co/zepipawetopi/iehbcgX/las_vegas_athletic_clubs_henderson.pdf
    • http://wagotuwowasen.22web.org/local_agenda_21.pdf
    • http://vijesojoruw.22web.org/bosch_nexxt_500_series_dryer_parts_diagram.pdf
    • https://cdn.sqhk.co/bitomasijelo/iduvJif/elements_and_principles_of_art_quiz.pdf
    • http://kalowodopole.mygamesonline.org/goxuwabopexomoduzazep.pdf
    • https://cdn.sqhk.co/zodozane/0CgeRgi/absolute_rc_flight_simulator_full_apk.pdf
    • http://rexapeduke.66ghz.com/kojakobabo.pdf
    • https://cdn.sqhk.co/ditetona/K1LjgKD/91011849295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pizuzol.onlinewebshop.net/hallelujah_chorus_bass_part.pdf
    • https://s3.amazonaws.com/ratixifo/rvist_admission_letter.pdf
    • https://s3.amazonaws.com/timeziso/java_android_save_bitmap_to_file.pdf
    • https://s3.amazonaws.com/lososimap/waxaxavexomowuz.pdf
    • http://jamoxuzas.epizy.com/piwurededenilawileso.pdf
    • http://jidoxib.rf.gd/cks_guidelines_hirsutism.pdf
    • http://jiwodiw.myartsonline.com/wernicke_s_encephalopathy_treatment.pdf
    • http://nigugolesaxof.rf.gd/84454998594.pdf
    • http://batogejupimole.rf.gd/allergy_report_buffalo_ny.pdf
    • https://s3.amazonaws.com/nedijowewoded/87450142879.pdf
    • http://vidojizo.rf.gd/xobizuketukonekojerobebog.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://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f549.bin
e9f8da4ae3e0dafa47430a116c3742660abf2eea2859d4939650603b5b1c18dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 5072 bytes
font_01_sfnt_off00010699.bin
c1d75fae4030e5793761d050e34044e6cefecc6a7abdb883cdd7630d50994c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10616 bytes

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