Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f61104782903162…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 10:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b2de2f6bf0b29c25b89cfd4f270aa193 SHA-1: 253a43615876b86da48b069679b3c484a52a327d SHA-256: 6f6110478290316279d5f955e196a6c441a8914aa84833d0b32db59c1c297f32
126 Risk Score

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 0.9986

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://infrive.ru/uplcv?utm_term=words+that+start+with+b+and+end+with+e PDF link annotation
    • https://armature.ir/cache/fck_files/file/bunewowa.pdfIn PDF document text
    • http://elitk.ru/_files/19507978225.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/65039577023.pdfIn PDF document text
    • http://steinemann-ag.ru/69648814143.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/zinep.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/waliriben.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/72021659887.pdfIn PDF document text
    • https://sambelteri.com/contents/files/51740817268.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/sozadopoduwez.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/79293727953.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e711c258d---mabogirel.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/4180197727.pdfIn PDF document text
    • http://actinq.nl/upload/file/61061354748.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/lonini.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/45179414926.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/53214532190.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/44282213013.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nanikovevefudozoxap.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/60206787455.pdfIn PDF document text
    • http://519pf.com/userfiles/files/45229198787.pdfIn PDF document text
    • https://henuopack.com/d/files/bekererupebobitufinuzes.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47A 10516 bytes
SHA-256: e3e3b2bc8136b86fe50b65eaa9c02428d998641c3d71c02eca5d63151116c0ae
font_01_sfnt_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 17624 bytes
SHA-256: 446021699b707c2dd43442a7f7b5cad37aa3218fdf3270be2eeea93deaff48b3
font_02_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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