Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf77ddfccc253136…

MALICIOUS

PDF

79.2 KB Created: 2021-06-10 06:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b45054289bd483b40469affa81fa70a3 SHA-1: c116db95b667007bd7991d72bea74f52fa619e2b SHA-256: bf77ddfccc253136fdda2ffbd099326cab94427c2e9fbdb4171ffca0d7694539
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://irlanc.ru/pbw?utm_term=1st+year+physics+book+pdf PDF link annotation
    • https://volifutizur.weebly.com/uploads/1/3/4/6/134602954/7177046.pdfIn PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/6586062.pdfIn PDF document text
    • https://ditaluli.weebly.com/uploads/1/3/5/3/135325413/531ff.pdfIn PDF document text
    • https://milalidit.weebly.com/uploads/1/3/1/4/131437162/rakeloxedemi-pifefunazame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxakuruvi.pbworks.com/f/69217134179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804a1bb5-4585-4e04-b01b-72a31ad4cc30/dedojaruwubekiwokavifif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60df4dc9-4743-4af5-b44f-dc2d43d5e9b0/libro_para_colorear_netter.pdfIn PDF document text
    • http://rapigidezuw.pbworks.com/f/pidob.pdfIn PDF document text
    • http://siwunugilul.pbworks.com/f/milozapujasujarafukavig.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144886995/35257989189.pdfIn PDF document text
    • http://junerew.pbworks.com/f/star_vs_the_forces_of_evil_magic_book_of_spells_codes.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/dojijonatipape.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/4899631182.pdfIn PDF document text
    • http://zumejukikug.pbworks.com/f/how_to_write_a_cv_for_job_application_in_bangladesh.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144695898/woligumugiri.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/pichaikaran_tamil_movie_cut_songs.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/144590547/how_to_cast_photos_from_mac_to_chromecast.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_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 5472 bytes
SHA-256: f7dcec2d752d776b2ca0c639fec2808d51b6a8ead5b924ff6ba8a16e68d2dd41
font_01_sfnt_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 11076 bytes
SHA-256: a932e2ad6ddfe74f8292fe90925079bcc4d883c950055bd455f5dc8e9aebb319

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