Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a0795c16588111…

MALICIOUS

PDF

78.4 KB Created: 2021-04-06 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04bd86e62a5f201a8f7dbe23dc2380df SHA-1: b84f85ecb039c232e10c60df6502a239e6023f51 SHA-256: b0a0795c16588111b63d984cde12aa162a865474579fc38cc732436d83f7be51
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, with a critical detection score. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'mental ability test questions'. No scripts were extracted, but the presence of external URIs and the nature of the detection indicate a phishing attempt to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=mental+ability+test+questions+with+answers+pdf+for+class+4
    • https://suxexekara.weebly.com/uploads/1/3/4/6/134635419/2610600.pdf
    • http://pesisasije.22web.org/carmina_burana_portugues.pdf
    • http://xigujawuruwuko.22web.org/par_excellence_definition_bible.pdf
    • http://movizopolu.medianewsonline.com/pomugelodo.pdf
    • http://pukepel.22web.org/bejudinurafo.pdf
    • http://wedagumo.iblogger.org/panasonic_kx-t7731-b_user_manual.pdf
    • https://surogupidaxa.weebly.com/uploads/1/3/4/9/134901722/6323e5e.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/jidivuref.pdf
    • https://vasigigu.weebly.com/uploads/1/3/4/6/134607878/kusot-zujakadidukapej-kuzarowut.pdf
    • http://zigoramad.iblogger.org/ln_rules_cheat_sheet.pdf
    • https://static.s123-cdn-static.com/uploads/4481847/normal_60013c4c05250.pdf
    • https://kuwovewifinux.weebly.com/uploads/1/3/0/7/130775990/5704458.pdf
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fcd75f256a74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nawevoted.epizy.com/69994120985.pdf
    • http://jipajarukureji.rf.gd/40860225329.pdf
    • http://mulunatebena.epizy.com/tumolatisoraxudasisin.pdf
    • http://wegexaluda.epizy.com/absorption_coefficient_definition.pdf
    • http://junedujivoxoz.epizy.com/3858000377.pdf
    • http://gematufevisuw.rf.gd/82704080214.pdf
    • http://molagegivijoxu.onlinewebshop.net/addendum_to_rental_agreement.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db32.bin
1fad6f9ee277cc5b3e43f684291da63efef181cc81f1e03823feade669845901		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 5796 bytes
font_01_sfnt_off0000ef05.bin
16a0b5194cbb8e3b797168eee58641c173fec797b8ff60774a841817b8caceb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10912 bytes
font_02_sfnt_off0001143e.bin
715be90826d58fcf9e7eb4b90a4e070696d834b758e39869d9c9f578fa9c9a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 16100 bytes

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