Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0c574f78728234…

MALICIOUS

PDF

75.4 KB Created: 2021-03-06 09:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 86b33e99cf556387a1e2a065e395a7b7 SHA-1: 457634d3f478db28237b4674a219d02d558500bd SHA-256: 4d0c574f7872823406de5fdb31af901adaed17d71c60908caded1ef4e674278b
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs. The primary malicious URL, https://pelibifir.ru/aws?utm_term=kokoro+natsume+soseki+pdf+descargar, is likely used to host or redirect to a malicious payload. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to trick the user into visiting a malicious site, aligning with spearphishing tactics.

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://pelibifir.ru/aws?utm_term=kokoro+natsume+soseki+pdf+descargar PDF link annotation
    • http://leftoutclub.com/bin_anamat_application_formya934.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/pKiejix/clockwork_orange_costume_diy.pdfIn PDF document text
    • http://gordei2d.com/caledonian_canal_skippers_guide3dnea.pdfIn PDF document text
    • http://rodina38.ru/dsssb_answer_key_2_175jr18.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/jigeNVx/batitidalasef.pdfIn PDF document text
    • http://handler-autoscout24.com/toto_washlet_s550e_installation_manualgfy07.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/mTNTieX/donajedixolufi.pdfIn PDF document text
    • http://mawifit.iblogger.org/pofudawuniwabufoxa.pdfIn PDF document text
    • http://siwevizinoguji.22web.org/22096158469.pdfIn PDF document text
    • http://cafe-cok.ru/lupegadugawexeliv24wyc.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/M2MgidN/satuwunorexid.pdfIn PDF document text
    • https://cdn.sqhk.co/zapoboveje/ggSjjgd/odd_man_out_book_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/crossword_quiz_answers_music_level_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/luwekiratotababexobolaxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/wuparij.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/learning_spanish_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/libupuxuliwetijekuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/22262251311.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/a5_flyer_design_templates.pdfIn PDF document text
    • http://lamerowed.rf.gd/2277682132.pdfIn PDF document text
    • http://fisuzes.epizy.com/bristol_city_former_players_association.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 5476 bytes
SHA-256: 3156cae644c7f30ac646d056c24cb55ca4007bb9c11ae22ab1b6f94af93785b1
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 11380 bytes
SHA-256: 10bb831a7c03ec651e0be50c9cb2c7b597c2cd60599d14158bb9a15bfd900565

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