Malicious PDF — malware analysis report

Static analysis result for SHA-256 318fbf8d3553847b…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 14:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7e677f4fdd937d025d938c304d8d7e8c SHA-1: a1baba6e7d6b5f8a49050f0ea08999317b311906 SHA-256: 318fbf8d3553847be5c843261703f0d0c10b7c400233fbf2ec9e8f6e0552429d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('nipisod.ru') that is likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of multiple links on disposable hosting further supports a malicious purpose, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=casio+protrek+prg+270+change+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386349/normal_600d2550800b1.pdfIn PDF document text
    • https://gevupowola.weebly.com/uploads/1/3/1/4/131483584/xomodarabukejedaziw.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/tibos-rexivokegetaduk-ranopesozog.pdfIn PDF document text
    • https://kavuxidawikux.weebly.com/uploads/1/3/4/0/134000359/nipolu.pdfIn PDF document text
    • http://degitowexara.iblogger.org/jafiduxanorabuwaj.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/how_to_do_an_impromptu_speech_outline.pdfIn PDF document text
    • http://setobow.22web.org/zekozebegexefonesizi.pdfIn PDF document text
    • https://daginunus.weebly.com/uploads/1/3/4/5/134597638/4289186.pdfIn PDF document text
    • https://wofefewivesupas.weebly.com/uploads/1/3/5/9/135957376/rokitaxiwosap-vunazas-nasuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_60322f3b6bb81.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/gjificT/fevuvijosep.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/eMiaa4x/clarity_large_button_cordless_phone_for_senior_citizens.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/fomorurel.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/mikibetiv/jitexalibube.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/receptionist_resume_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/download_audacity_for_windows_xp_sp2.pdfIn PDF document text
    • http://pexevogawi.epizy.com/kosufenekolitorarot.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/muzegawuruke.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/suxaxenasovobefetanutunoj.pdfIn PDF document text
    • http://magivuxitafexox.rf.gd/54238861540.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/31259911462.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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5636 bytes
SHA-256: 004a7bb7295b88d3395b59eafc10de15d7c6eccc482b372711b91bb2f8f5f898
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 11144 bytes
SHA-256: e3c52c9fbe48c6a2c958293fe3b2e28309c4c28c7b2d170989ec5ddbc29c1c64

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