Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2935d3cd57d00b…

MALICIOUS

PDF

72.6 KB Created: 2021-03-30 05:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4d16fb4400aa89487cd34c6b5fa9d61 SHA-1: 5a3a4342f95c96ba6708d00ae3a3a0446dadaa9c SHA-256: 1d2935d3cd57d00b35a6822ffcf670e3afe29bbc3f666fe86465da00bd221e63
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9991

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=catabolisme+et+anabolisme+pdf PDF link annotation
    • https://cdn.sqhk.co/mekerijiwuv/jex6Tjd/red_alert_restart_chicago.pdfIn PDF document text
    • http://tupujetu.sportsontheweb.net/rapidex_english_speaking_course_book_in_marathi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/fhcjbic/shattered_glass_megatron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_601b92606d61f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_603ceb9755c74.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/vejamidap.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/how_to_program_remote_for_liftmaster_myq.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/what_is_a_metaphor_for_a_house.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_6025296241643.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/gdgdWhg/guide_for_among_us_walkthrough_episode_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_600dfef975a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_6062622d70b02.pdfIn PDF document text
    • https://cdn.sqhk.co/nenutipu/egijhii/73951635291.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/UfUP2jK/sotumiwejasuzopavetol.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/4eb112da-7902-42e0-9f33-451c866df760/something_like_this_lyrics_nightcore.pdfIn PDF document text
    • http://vawofirulev.myartsonline.com/nezesozamuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13955f61-4b81-41ba-9a43-91c4c8b9f3df/biochemistry_books_for_mbbs_indian_author.pdfIn PDF document text
    • http://nevafofuvabovid.atwebpages.com/artritis_reumatoide_tratamiento_natural.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b37eec-3e88-4fb3-872b-5a085ffdd434/kuxikivadefujased.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2eb120f-b1e1-4899-a48e-3df751672e0a/14316809063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf1871f-979b-49be-8077-bf4811f256db/67327909940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a90c3bb-bf52-4be1-bf0d-d56211972a21/woodworking_for_dummies_review.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/long_way_down_lyrics_robert_delong_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e429ba-837c-4fae-88b7-8cf066330e67/tokyo_ghoul_season_1_episode_2_summary.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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 5136 bytes
SHA-256: 8f492b303c9d16d4a6573fd1a228893367c5ae4112b42b569c14ec682fe37aa5
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 11492 bytes
SHA-256: 81334994b9a61298a50950549e012c2f179bb974c34f90beec4495f026f8b599

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