Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f6f39d9931bfd7…

MALICIOUS

PDF

77.0 KB Created: 2020-11-20 01:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bd958bd4ba9e7b6cbf55b3e8433f1d58 SHA-1: b9f3138723fc6c4803f8b348bf23f8f848d85e7c SHA-256: f1f6f39d9931bfd78ec3c18335b4f53dcdc36f8336f556788acb4f35bf460db2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/strik?utm_term=party+hard+levels PDF link annotation
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/7fb30dd.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/8047150.pdfIn PDF document text
    • https://relibekagojuxi.weebly.com/uploads/1/3/4/6/134605829/gikatipudipo_fumezibabuj_mapilowi_kubafod.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5fa8059f8941c.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/6716330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_5fb54e4d50d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f889f49f270c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fenatagazise/form_73e_act_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/69635455515.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/magic_kingdoms_cheat_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42deef83-1d0a-4ba5-9b4d-6ac2cd48c017/problemas_de_aplicacion_ecuaciones_l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2bcd0b-d7dd-40f4-b24f-96f19cdd3a32/monster_coffee_drinks_caffeine.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gufefo.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_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 4600 bytes
SHA-256: 01f443b290606d9295a6c9def4c09ef9641e5fab4299a89760a245a73d808d24
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 10880 bytes
SHA-256: 19718b4bc183b36b115f3e3630b2a211609dd0b315da29a95c5d55f2e6161aa5
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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