Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c676b3aa7d4508…

MALICIOUS

PDF

82.8 KB Created: 2021-03-12 12:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 31b9e8b4bd39b91564f3111fc76b2af8 SHA-1: 0d9947ea02443fe50d6032faa570fc0bc0e35d94 SHA-256: c5c676b3aa7d4508f2d2be83159b1464628488824465c64dfaba7c2f3a304ffc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=network+penetration+testing+report+pdf PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/TEhdrCH/netflix_christmas_movies_2019.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/30266847981.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/curso_de_guitarra_espaola_online_gratis_para_principiantes.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/PjgR4hg/gakexawefuzikow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_60206a932c896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_60436c0b9ed41.pdfIn PDF document text
    • https://cdn.sqhk.co/pokemazikera/46KhhLD/sironumixikikotivavuvebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_60227489e16ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_602e48674f104.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/ojiifgc/zinape.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/bajanatowiwimikusubur.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/why_were_the_bantu_migrations_important.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/66200912751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe5b2d1-1460-4eb3-baf1-4f96fc2de743/99948602298.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_6596908e3231437aaae32e7936a49a6d.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_28186509151943abb0a7bd2e931fd376.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d115f75a-b91c-4345-9f52-bf76b6202a65/the_wicked_kingdom_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ade1253-2a13-4328-b2df-1ce82d157323/wokatowugifin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24788b2-9f3f-4278-af47-88e9dd375501/los_juegos_del_hambre_sinsajo_parte_2_pelicula_completa_youtube.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_9db47ab8575542fdacb23082ccfa721f.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_2ba1593f21e34c81981ec0fa8141dfa5.pdf?index=trueIn PDF document text
    • http://fijorolur.myartsonline.com/aflac_short_term_disability.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/biological_theory_of_crime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0028974-b4d8-47c7-b771-b92a4a11c02a/biguniwegorivexoti.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_f0aba94eb7d14b9fa494ce7cc963b5aa.pdf?index=trueIn 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_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 5300 bytes
SHA-256: d978ea7684055f694045e046d0d076f092e97a81fb7770b9515216f759441bef
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 11624 bytes
SHA-256: 9b6901d0b5701c815b51fe94d054947d26f6c771d8fe93402edd69a3dd43b633