Malicious PDF — malware analysis report

Static analysis result for SHA-256 52549fc4c2190f76…

MALICIOUS

PDF

76.8 KB Created: 2021-03-27 13:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ec1d09292651148729a23b6d805073b SHA-1: ec5a7b3dd796285e488bb65cdc267e5a5a94990e SHA-256: 52549fc4c2190f76cc13b42e8d628c89b873864b41f3d72224a01a4a5f7d8e3f
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/award?keyword=isotope+practice+worksheet+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/nebafori/hjeZYoc/72542427301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_605ab82eb5380.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/ZmicWFI/baginononagovaluzojen.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/darogigej.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/describing_acids_and_bases_worksheet_answer_key.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/how_to_set_up_a_project_management_office.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5ffd52d17d82f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5ffa1c47a2237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_604d38afe4553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcdcbe0034f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_600ddf7fbc4ee.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/ewCgdgx/cannonball_run_doctor_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/riijcFn/17325720491.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/f98848e5-6388-42da-9b53-a3d46fc70ba5/classical_guitar_songs_easy.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/ayurvedic_medicines_books_in_marathi.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/marantz_nr1403_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30bcf07-d05a-4cc8-a708-a69f6d7ee126/62079103100.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/vuxilutap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a44aac-5d1e-4b52-818e-5b5dca38dd26/how_to_get_my_georgia_drivers_license.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/39182466633.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_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 5304 bytes
SHA-256: 59e5986996300c359084e3da5b8447e7e74235ab84daace0f7dccafe73574d38
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10304 bytes
SHA-256: b3b5892977912be5bf85d898f9747991095be430656eb8293ecc33be712ef31f

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