Malicious PDF — malware analysis report

Static analysis result for SHA-256 d433a3f2b539915e…

MALICIOUS

PDF

74.6 KB Created: 2021-03-24 15:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a22e5b744f343a4dd4a6f7820af10283 SHA-1: e8aa1d939e7a96811703f45e761a6cbed680d8cd SHA-256: d433a3f2b539915e70e01dd6915b11ce26d082d6715eaf69cb9c414668f1f3a4
116 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to 'generate barcode pdf' and the wkhtmltopdf tool, suggesting a lure. A critical heuristic identified an external URI pointing to 'kuzutuzo.ru', which is likely the primary malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=generate+barcode+pdf
    • http://wotaxatumumodok.sportsontheweb.net/prayers_that_rout_demons_by_john_eckhardt_free_download.pdf
    • http://milanbeachs.space/how_do_i_set_my_verizon_remote_to_control_volumekcvq2.pdf
    • http://zopesozali.mypressonline.com/32686997504.pdf
    • https://static.s123-cdn-static.com/uploads/4380694/normal_5ffb3e275922e.pdf
    • http://nout-sale.site/titigitatokuzcc5rk.pdf
    • http://motorutovibipe.sportsontheweb.net/potenciadores_y_acentuadores_de_sabor.pdf
    • http://warewakeb.sportsontheweb.net/zesenajeno.pdf
    • http://guparob.mywebcommunity.org/2822839948.pdf
    • http://fibiver.mygamesonline.org/adobe_after_effects_cc_tutorial.pdf
    • http://dotixomovi.sportsontheweb.net/vurakezozudivukugafukaw.pdf
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6014951024354.pdf
    • http://pemizirevubel.mywebcommunity.org/kugibudujevebesok.pdf
    • http://biwedujurar.mywebcommunity.org/photosynthesis_lesson_plan_middle_school.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zukomakiduw.myartsonline.com/98045851470.pdf
    • http://sokekakeloji.onlinewebshop.net/faxatalefeketisix.pdf
    • https://s3.amazonaws.com/xurixado/xufonexapirizilevi.pdf
    • https://s3.amazonaws.com/dakebesuvum/achtergrond_kleur_word_naar.pdf
    • https://s3.amazonaws.com/tajimipojimo/72817282220.pdf
    • https://s3.amazonaws.com/gomaxod/55370817391.pdf
    • https://s3.amazonaws.com/bomupi/schlage_electronic_lock_battery_dead.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_off0000e5d3.bin
a37850aef11a0b2ea9f7d2d63df4d3eba55806aa0e0bc3218eeb0895dc00d724		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 5108 bytes
font_01_sfnt_off0000f73e.bin
f8a6955b825c141683c2c014932ff3f6ad51c158396c16424bb81a2fd73f36c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 11452 bytes

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