Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ca0fd9eb86d223…

MALICIOUS

PDF

77.5 KB Created: 2021-04-10 20:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 37341c22334f94856c4d13541b3822aa SHA-1: 5a30bb730ffcd2be94ab6157b7f4b3194d6f8313 SHA-256: c9ca0fd9eb86d22394e9433cc7a773ec5bb1bdbee3a2c24bd289cb2c976ab172
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to disposable hosting and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

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://maypoin.ru/strik?utm_term=jonathan+livingston+seagull+movie+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497685/normal_600ca6aa9f076.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/3806036220.pdfIn PDF document text
    • https://fakanodadix.weebly.com/uploads/1/3/4/3/134371587/30458e489a712a7.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/8826792808.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/an_introduction_to_statistical_methods_and_data_analysis_ott.pdfIn PDF document text
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/vukuritofogupezem.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/88125183789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_601b2cce9963d.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/valimem.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/depiromavodiwikolepog.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/life_cycle_cost_and_economic_analysis.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/xarasazekipoze_bapuxufuj.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/fojogozejaxovusazuxom.pdfIn PDF document text
    • http://futajef.medianewsonline.com/dudogoxazezopixuxew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepominofujemo.atwebpages.com/vodagiderefosoxibeg.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/52168662414.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/53699920600.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5240 bytes
SHA-256: 8b41b0a03c36c3d05d9dbc065bb7cd671445163d26b80a329f566f00885add42
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10876 bytes
SHA-256: aaf0447d22f46cb6f687bfa19eaacff156b125808c987e607f32e46719bb7524

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