Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a878eb7b58faf0d…

MALICIOUS

PDF

109.3 KB Created: 2021-04-09 15:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5b18870c0a4727f1b024943c516c7066 SHA-1: e6ddbc7553e62738256bf9ba3848eb3e25efd36f SHA-256: 7a878eb7b58faf0da78fb4e2ca78377f1d30e277bedf155723e0fa02c68da9be
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'kuzutuzo.ru', which is suspicious and likely serves as a lure for phishing or malware. The document body, though heavily obfuscated, suggests a theme related to the 'Unabomber manifesto' and 'free audiobook', indicating a social engineering pretext. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=unabomber+manifesto+free+audiobook PDF link annotation
    • http://wedasuf.getenjoyment.net/57868337262.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jiTjehf/34083695342.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/21884106495.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/h1gftzH/rezijixobebubusolovifapuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/Kiegfhg/spellforce_heroes_magic_apk_full.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/nepozojovefibijilarevegu.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/beiiwz9/adobe_dreamweaver_cs6_website_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/bhiwWhg/91548964577.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/votikonuxajafavup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/151b2e59-acd3-48cd-b270-269d2d2d8503/87251961143.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/konoloteri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c28053-3127-4632-ada6-72b1931d38f4/iphone_5c_price_in_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc98cbb-e3c3-48d1-b14d-37388e30b601/44970092484.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/cheriyal_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcef882d-6817-44af-94f6-7f2947fc3a83/what_is_another_word_for_olden_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e31dfd3-6046-401e-91e9-4940a7e0762f/5_informational_text_structures.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/canada_food_guide_example_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb9ab3e-d895-4e7f-b302-5eb75d48d8ab/how_to_setup_hp_deskjet_6988_wirelessly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfbffb1-096b-46c0-bb34-b797a4926bb7/56726850220.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/yo_whatsapp_free_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a4860c-952e-4022-a8a1-4dced37158a8/bizinoxodizumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2f51ce-43ff-4b01-b546-368d97f90cbb/soundcraft_ui24r_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9f6609-a05e-44d9-9548-ce1cde3dcf85/19902027024.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_off00016f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9D 5216 bytes
SHA-256: 34d31cf58f93e9beccda00ff3c29bebcb3768f6d8fd837c084c0872b3945c9f6
font_01_sfnt_off0001814c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1814C 11140 bytes
SHA-256: faf5b8e53d3d83863ebeadd1b4d8caae6e571f297e44a26e0a401d394f9343bd

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