Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e08f7198f5e731…

MALICIOUS

PDF

84.2 KB Created: 2021-04-08 18:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 942c7a0682fcf2b496fc1ccb8fd8edd3 SHA-1: 54e0efee97eeb5325621e57498b90fc1d4a6f538 SHA-256: f2e08f7198f5e731d9b05bf561ce104da5f16a3d88810505c6419240cf51674c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=what+is+today%2527s+julian+date+number PDF link annotation
    • http://bukuxojunuz.mypressonline.com/pagosufajuroxosodosoba.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/62591669430.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/ancova_in_spss.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/vuwodeworitisupup.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/les_ataxies.pdfIn PDF document text
    • http://novijixonusasu.mywebcommunity.org/sifije.pdfIn PDF document text
    • https://zipufalazuviw.weebly.com/uploads/1/3/1/8/131856517/visobu-siragurom.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/fejonasikod.pdfIn PDF document text
    • http://sopafekidis.sportsontheweb.net/byzantine_art_and_archaeology.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/66859861-ee10-4993-875a-496b761851dc/pafojivolosiwixesemebakin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c5cc8c-50f0-4442-97e2-1320861f796f/pisefifeburipiberekaluked.pdfIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/95773789193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7b44fa-906e-4de6-a965-e0fc14afac38/cirque_du_freak_book_6_read_online.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/xogawitoxaxonibegesu.pdfIn PDF document text
    • http://reladefuxuna.onlinewebshop.net/fuwoxojaletalagikipera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc6c5e2-3107-4a6a-a160-0ad1b9a2402f/loud_ringtone_for_samsung_j7_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421b2ac7-b8de-4f39-a92b-327846094535/how_big_is_a_small_soccer_field.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8fecad-58c3-40f5-8a76-df658c3027b9/tusibugugetesal.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/dadik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f235ef7e-51a9-443c-9263-7d6554ce22e4/sexabakirufoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bbed55-de2a-473f-a458-08d4b83460a1/88295484930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46eef4d8-c5ae-44d3-9e7e-41c419c7a190/asu_wifi_android_domain.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_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 5428 bytes
SHA-256: 9a8ebf07125af8fbefa54a67de25353c014a6db43fbcd787fb1faedcd1b8c789
font_01_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 11068 bytes
SHA-256: df2d09734cffbba5da51d65d989b1b6df7ca904d44ad33d575424772db134952