Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3b6275e8e3e3af…

MALICIOUS

PDF

80.5 KB Created: 2021-03-17 17:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1755690be0be54c2b1ea9828efbfb92d SHA-1: d880b32c27075b03b033761f25df0c19b06b00ef SHA-256: ca3b6275e8e3e3afd5feef0f4b054d38047efb79f7eaa588ba28728a25dcef49
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/wix?keyword=princeton+2020+commencement+program PDF link annotation
    • https://cdn.sqhk.co/jimumakevaji/heVghjf/devil_skull_death_3d_theme.pdfIn PDF document text
    • http://cardio-active.site/nabogawijanazubayk03w.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/6fhbTgi/horizon_blue_pearl_crosstrek.pdfIn PDF document text
    • http://salonhq.xyz/getty_images_freehcixu.pdfIn PDF document text
    • http://pubgmobiie.com/ximokomexeloxobpq7sj.pdfIn PDF document text
    • http://hot-money.fun/77767695391mqnfw.pdfIn PDF document text
    • http://loveworld.club/pride_and_prejudice_movie_netflixvqt4v.pdfIn PDF document text
    • https://xiriwedonup.weebly.com/uploads/1/3/4/2/134265341/dozumibupifa_ruruw.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/risube-bodukawa.pdfIn PDF document text
    • http://4kuhd.me/bibugixofijokodadizqi70.pdfIn PDF document text
    • http://chestlune.online/depariocjtc.pdfIn PDF document text
    • http://orbitan.fun/vuzewor8pl5.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/jebokizez/what_are_the_three_raw_materials_needed_for_aerobic_cellular_respiration.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/oxford_english_thesaurus_for_schools.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/child_psychology_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/tewuzesuxakena.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/construction_company_profile_format_free.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/tukabodad.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/10551268043.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/socrates_pain_assessment.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_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 5320 bytes
SHA-256: 435a30bf017a1bf046430206536517dc9944a3ab0a9458277eb0f98ca55cd426
font_01_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 10420 bytes
SHA-256: 0dc193968b21ca0d5b191ca0798e19e88f681f3a0acf7cfebfc16dd9e5906fce

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