Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bf81a0f3f4b15d…

MALICIOUS

PDF

71.9 KB Created: 2021-03-25 03:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ff2c7b0208c9280dc38e019dcf4701bd SHA-1: c878ee2ca51ccfa86ff55a959976f4ae28439d44 SHA-256: 89bf81a0f3f4b15d331d1974ce2fcb048fb9179372c614c060a25ce867414dc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily garbled, contains text fragments that appear to be lures, such as 'Firepower threat defense 6. 2 configuration guide'.

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://gimoguvi.ru/123?utm_term=firepower+threat+defense+6.+2+configuration+guide PDF link annotation
    • http://talajudoxuxip.mygamesonline.org/87589211341.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/verajagu_porumipesozuzig.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/autonomy_meaning.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/48548281903.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/62560617246.pdfIn PDF document text
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/4170406.pdfIn PDF document text
    • http://novuvomedo.iblogger.org/4150390762.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/nelexopimiside.pdfIn PDF document text
    • https://rogipusuwegurak.weebly.com/uploads/1/3/0/8/130813654/mekebivovikikepile.pdfIn PDF document text
    • https://namosozevo.weebly.com/uploads/1/3/0/9/130969937/lunuze-fibeme-wijuzowexovobaf.pdfIn PDF document text
    • http://xalukofokunes.iblogger.org/zosaroputuvefi.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/bawapenikagupakutojafozev.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/galatea_2._2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gibidapasajug.atwebpages.com/temivet.pdfIn PDF document text
    • http://zarenubopopo.epizy.com/google_chrome_for_redhat_linux_5.pdfIn PDF document text
    • http://pixagikaw.epizy.com/safety_incident_investigation_report_template.pdfIn PDF document text
    • http://xawaduvuxulamef.epizy.com/61884723295.pdfIn PDF document text
    • http://gokutirimavav.rf.gd/zogunabaxit.pdfIn PDF document text
    • http://bitokirapaxeg.rf.gd/are_infrared_heaters_more_efficient.pdfIn PDF document text
    • http://tubunul.epizy.com/australian_engineering_drawing_handbook.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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 5748 bytes
SHA-256: 44ca42ef6832683624c68d77fb1f8b9c2b99fdf934c991a710d977a3dd2e6d81
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 10128 bytes
SHA-256: 69e87621a4c3d204c2d4117326674dbd2eb4335b8a4fc80fd074883eb776ff49

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