Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5fb07985cf2812…

MALICIOUS

PDF

65.9 KB Created: 2021-02-12 19:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4270e7ff06a7d5098f398e1742f652b8 SHA-1: 434c51dd73678895b648b695c42d0c687815411c SHA-256: 6c5fb07985cf2812b7edfcd3a1622df6c5b76b7e5945376c00e4cbe2cc10b889
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to 'grammar and composition handbook answers', likely intended to trick users into visiting the malicious URL. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/123?utm_term=grammar+and+composition+handbook+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fdef22524782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5ffea3c2cdae0.pdfIn PDF document text
    • http://logvoz.ru/fibubapijawaparosorepaku24aja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_600111565e99b.pdfIn PDF document text
    • http://hellesypakk.online/fezekasopy2vp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421783/normal_5fe0d54349ff1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449775/normal_60060b459a2df.pdfIn PDF document text
    • http://zomoxesami.22web.org/webiziwafularavipa.pdfIn PDF document text
    • http://prostosite.site/diktator_quartett3js7.pdfIn PDF document text
    • http://lolafoduluj.22web.org/mann_movie_song_aamir_khan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_5fe999f2b09ee.pdfIn PDF document text
    • http://werewov.22web.org/angry_birds_rio_2_free.pdfIn PDF document text
    • http://astrohelp.space/employee_experience_journey_mapping_templatef67lt.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/mesotodimus/lean_on_me_beginner_piano_sheet_music.pdfIn PDF document text
    • http://tagitefidunun.epizy.com/hirohiko_araki_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/fmcsa_national_registry_form.pdfIn PDF document text
    • http://xoxemofunox.epizy.com/hodder_education_igcse_biology_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/usda_dietary_guidelines_saturated_fat.pdfIn PDF document text
    • http://dimizisunope.epizy.com/41366110086.pdfIn PDF document text
    • http://jisufuwoj.epizy.com/android_studio_update_version_number.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/xujexume.pdfIn PDF document text
    • http://xolijuvusuv.epizy.com/weather_report_for_lewisburg_west_virginia.pdfIn PDF document text
    • http://jodewejuwuw.epizy.com/jabariya_jodi_full_hd_movie_khatrimaza.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/porugibinuragonutuzu.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_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 5608 bytes
SHA-256: b241ef11f696eba3460012a41db7669d294a6dacd62f4d2dd626e29041d77aca
font_01_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 10616 bytes
SHA-256: 1c6867784e070c59c0ccdd18fbc993289b5c247b8d116745c36560c650000238

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