Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8bd95558c8b8c5…

MALICIOUS

PDF

85.9 KB Created: 2021-03-18 05:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4b265abaa3c077e5e5cdd813bf836e1b SHA-1: 55c79202cc342576b0726bdd15c84834aa081974 SHA-256: aa8bd95558c8b8c527f7b2bb6cfae3ffdfe9bb46051e7a969b87665e12783c3c
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 0.9998

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://ponafet.ru/123?utm_term=gloomhaven+elementalist+class+guide PDF link annotation
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/kujajomiru_nazawuvanetor_wizev_rupawiforitivid.pdfIn PDF document text
    • http://dudoxanudito.scienceontheweb.net/75800544104.pdfIn PDF document text
    • http://eliyalte.com/free_printable_alphabet_worksheetswj068.pdfIn PDF document text
    • http://milanbeachs.space/adverb_clauses_worksheet_with_answeruzgpp.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/eureka_the_boss_power_plus_vacuum_cleaner.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/g_shock_ga_1100_price_malaysiar47ov.pdfIn PDF document text
    • http://ooovseanalizi.ru/amar_chitra_katha_ultimate_collection_listefbb9.pdfIn PDF document text
    • http://1ux.site/bojivotewp3kgq.pdfIn PDF document text
    • http://pasoponetev.22web.org/gawugudigixadituninujane.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/delf_a1_livre7mejw.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/666a1a1ceb3141c.pdfIn PDF document text
    • http://guferesuzas.22web.org/sidakamelor.pdfIn PDF document text
    • http://quickpapp.online/bates_motel_imdb_episode_guidebsxcj.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/clubbers_guide_20096im15.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/printing_company_profile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/nujifilekuzesudojifoz.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/latest_software_for_iphone_6.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/definition_of_goodwill_in_accounting.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 5348 bytes
SHA-256: 33c5f9ea0ebc22bd3da6c61583ca9a315cad10d43457a5c6ed30c4ffbb0cbaf1
font_01_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 10780 bytes
SHA-256: bdd83431b71ebe2d63388037680d6c969deddff4bcb4b313970365163f5a59ff