Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2d7649fc8f4fab…

MALICIOUS

PDF

87.7 KB Created: 2021-04-04 23:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8ff8bd551e63b44102a741cec3345008 SHA-1: cc937c4c4008d2b1b728e93601665555a84558e0 SHA-256: 8c2d7649fc8f4fabeb1050b639f2d1453272adf44d091ad8a68a9d3ddead9d67
136 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 heuristics indicating suspicious external URIs and invisible links to potentially malicious domains. The document body, though heavily obfuscated, contains text related to 'meaning of bullwhip effect pdf', suggesting a lure. The presence of embedded URLs points towards an attempt to redirect the user to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://mezovuduw.ru/award?keyword=meaning+of+bullwhip+effect+pdf PDF link annotation
    • http://jadebey-x.com/50406740145cgw1e.pdfIn PDF document text
    • http://helen-art.ru/bikelanadevesuxasodacbaxa.pdfIn PDF document text
    • http://ita-fitness.fun/lagumouhkhm.pdfIn PDF document text
    • http://loginwithfb.site/43991477323jc61u.pdfIn PDF document text
    • http://tonagruz.ru/modelo_de_acta_constitutiva_de_una_sociedad_anonimanx2u2.pdfIn PDF document text
    • http://farvestnn.ru/public_speaking_topics_persuasive7b5h1.pdfIn PDF document text
    • http://cashfree.store/soweto_gospel_choir_songs_fakaza7451f.pdfIn PDF document text
    • http://uspex22.online/why_is_my_battery_blinking_20_timesmt2nf.pdfIn PDF document text
    • http://idealica-ituficiale.website/google_form_sign_in_sheetp3s2q.pdfIn PDF document text
    • http://djami.ru/nudedokeligiwenolidovahk5ku.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/lozuzulexjl336.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/polojuliragam/lokuzevezegizutalurov.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/chopin_script_normal_western_font.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/warulifolonafuxidito.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/cowboy_theme_song_sheet_music.pdfIn PDF document text
    • http://monofetifalo.rf.gd/blended_learning_journal.pdfIn PDF document text
    • http://pumugotodag.epizy.com/answer_sheet_sample_for_ielts.pdfIn PDF document text
    • http://foraxevub.rf.gd/nancy_drew_movie_2019_songs.pdfIn PDF document text
    • http://fizojigijuzad.epizy.com/28165843693.pdfIn PDF document text
    • http://rufizugo.epizy.com/novartis_annual_report_2005.pdfIn PDF document text
    • http://wagarimorule.rf.gd/carnivores_ice_age_full_free_pc.pdfIn PDF document text
    • http://vemesivudaro.epizy.com/hp_designjet_500_800_series_printers_service_manual_-_english.pdf.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/the_damned_human_race_quotes.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_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 5380 bytes
SHA-256: b1033cb3ff5738466761d22080bc45bafdfa4e9a8f8a45190c5fa6b51f7fe5f2
font_01_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 11668 bytes
SHA-256: 45dc4fd06105385a2abaa0756043e3d045874575f99eb29b35d3d64ab2f24435

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