Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c39ad9c769fdbca…

MALICIOUS

PDF

78.1 KB Created: 2021-02-20 08:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aecd93889b75ddb40fefafe8f4e16425 SHA-1: ec742e98b88403ef99839e528793550362819f8d SHA-256: 9c39ad9c769fdbca08cc1a4e0b5678eda06b77a1f831d76e6bd39fe8cf4a4739
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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://maypoin.ru/wix?keyword=saga+real+pdf+katy+evans PDF link annotation
    • https://cdn.sqhk.co/purovufizu/BIOjhtP/90805888907.pdfIn PDF document text
    • https://cdn.sqhk.co/zutoruxutu/fbLXwoV/amazon_music_or_spotify_for_alexa.pdfIn PDF document text
    • https://cdn.sqhk.co/fotajoge/e2Gghix/switzerland_covid_deaths.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_602836bbc1732.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/hhjgPgg/how_to_bake_pork_chops_at_350.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/dM95hhH/xabitojikejetiwilemubor.pdfIn PDF document text
    • http://parkingtest.xyz/decimal_to_binary_conversion_exercises_with_answers4z5g9.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/5998537.pdfIn PDF document text
    • http://kersita.space/fundamentals_of_management_management_myths_debunked_10th_editionxaa8w.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/hjoSZB7/amazon_widget_iphone_verschwunden.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/djgjhhc/nova_launcher_fire_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_6022e7d5cf613.pdfIn PDF document text
    • http://runolive.com/jujapomuzamabudicqkau.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/bezegoluzose/janam_kundali_software_in_gujarati_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/bekopugukegodujupuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/kala_patthar_full_hd_movie.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_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 5536 bytes
SHA-256: 8b8e86915b12ed1fed7e01ae6d7f35bb7c4f7deb9427b88e5ffd77b4ec801c29
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10832 bytes
SHA-256: 1f485d73963dae4a9498f9d953f56986ccead2e3f27fe2379b6fae28c7cbec94

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