Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8316360f1a66b2…

MALICIOUS

PDF

77.7 KB Created: 2021-03-02 18:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c44f203b7d77f15524f421bb0a4d527 SHA-1: b2f019ceff3f5c81bbdc314a68ccdae8935abb9c SHA-256: 5b8316360f1a66b2bafb45278a026c12f253cfdc658a964a1454db77e8436d11
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://xezojetit.ru/123?utm_term=what+is+the+short+story+a%2526p+about PDF link annotation
    • http://mozodulo.iblogger.org/rainbow_fish_tank_for_sale.pdfIn PDF document text
    • http://sorulaxawo.iblogger.org/memrias_pstumas_de_brs_cubas_filme_completo_hd.pdfIn PDF document text
    • http://lejebodaz.22web.org/john_rawls_justice_as_fairness_a_restatement_sparknotes.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/1hijehg/xekefobus.pdfIn PDF document text
    • http://tefukuk.iblogger.org/bmw_330ci_auto_or_manual.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/12432617082.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/jazzy_select_elite_troubleshooting.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/1287354.pdfIn PDF document text
    • http://wikexulefusopa.iblogger.org/java_netbeans_8._2_tutorial.pdfIn PDF document text
    • http://runivofo.iblogger.org/math_worksheets_grade_3_multiplication.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutebavo.rf.gd/10130087857.pdfIn PDF document text
    • http://zarusorujot.epizy.com/ectaco_partner_lux_2_user_manual.pdfIn PDF document text
    • http://nimetegukixiz.rf.gd/vonexujolemo.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/15389918822.pdfIn PDF document text
    • http://tovegini.epizy.com/mawekeparosetofujigon.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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 4856 bytes
SHA-256: 9fc7edc57932f13a859c4939ad8cb7f4edbb8533412323795c502e6e3da3d459
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10820 bytes
SHA-256: 11ce657000b2a553d2b26be512d235c0132ed36680953369d6ade51a29634564