Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a024cfabd28e9a8…

MALICIOUS

PDF

82.5 KB Created: 2021-02-06 19:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c21439fe2eab3802400aa01346ef97b SHA-1: 58c2daa3e3340b4e86f2197e0db6d6f493a0b8d1 SHA-256: 8a024cfabd28e9a879ad22ee3cde7ff5c000d44b680eaf2c47ac6dd34ec4ed5a
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 0.9996

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/aws?utm_term=toronto+time+out+guide PDF link annotation
    • http://italysummer.space/fundamentals_of_computer_graphics_3rd_editionrh1z7.pdfIn PDF document text
    • http://lemixop.iblogger.org/gradiente_albumina_serica_ascitis.pdfIn PDF document text
    • http://damvglaz6.xyz/wusulofitarebesujqia83.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/hjdGeLw/portland_winterhawks_roster_2017-_18.pdfIn PDF document text
    • https://muwunijika.weebly.com/uploads/1/3/1/3/131398004/c1cdb0ba4df.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/fAahfjd/nobisita.pdfIn PDF document text
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/jogexatapagogi.pdfIn PDF document text
    • http://nout-prodat.site/vebujesewinu5gl8g.pdfIn PDF document text
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/ziluzupobojaga_furelebowowumi_sivigotazi.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/khihjif/datijezexiwakadizazusa.pdfIn PDF document text
    • http://losmopaka.site/brian_carn_gayf3jr1.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/HLkjjem/halloween_store_nyc_14th_street.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/1257765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gotazuvibidok.epizy.com/zutoxopigelitifal.pdfIn PDF document text
    • http://fepasike.epizy.com/dumedepe.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/54464050552.pdfIn PDF document text
    • http://vojapulipono.epizy.com/38277451951.pdfIn PDF document text
    • http://dujofaxuro.rf.gd/korevojixusu.pdfIn PDF document text
    • http://zezazemana.epizy.com/bts_all_photos.pdfIn PDF document text
    • http://zogivumomu.epizy.com/38880203016.pdfIn PDF document text
    • http://tukutuxobolekub.epizy.com/nasarineduzapisu.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_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 4676 bytes
SHA-256: 32328a61cee20a01508ffc59544dc7ce66ee9f170109695cb9e07043f6e234ac
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 11752 bytes
SHA-256: 5c57e16bced10583c8eb6880576c2388e0929cd2f39a740144b2c7b9bc516f77