Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9c865c537bf486…

MALICIOUS

PDF

75.1 KB Created: 2021-03-13 12:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f6e6c23695485ca1d8d766dbfec83aa6 SHA-1: 1b9aeab6e7ec822df2fa4e58c68c2a951d4967a8 SHA-256: 8b9c865c537bf48624f1b684f9629d6331eeb050aba4a1c64c6d488361b6487e
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. It contains numerous external links, with the primary one being 'https://maypoin.ru/123?utm_term=luv+letter+piano+sheet+pdf', suggesting an attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=luv+letter+piano+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419629/normal_60149243895a9.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/hhghijK/rezesuwuzuxamodo.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/geGRbhd/bubito.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/vimivoniluleno_rikev_jafurironujomi_ziwazuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_60279a713ce48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_5fda3a8df1a67.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/85623089489.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/applied_mathematics_modelling.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5fe1cd8ab62f2.pdfIn PDF document text
    • https://cdn.sqhk.co/wubejiwixu/icjjdij/2739050543.pdfIn PDF document text
    • https://buwavazazaradig.weebly.com/uploads/1/3/3/9/133999961/wutabigupimulesex.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/50129030131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5ff8b1bf48a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_600dda2031571.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://uploads.strikinglycdn.com/files/ef62668e-fce9-43f6-ab60-6a3ce07fd37d/sp_racing_f3_evo_brushed_flight_controller.pdfIn PDF document text
    • http://fozozip.onlinewebshop.net/zunupudifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdc72f3-a2bb-497a-94d0-782407ad1327/resufezuvijexewob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2131d57b-f627-44d9-89ca-edb6b5767d4e/fijosopobapigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3b703b-6f48-42be-98a1-539d06c1d4a5/81854755115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4918a628-ee5b-4258-b37e-349e4224a01f/miguw.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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 5012 bytes
SHA-256: f5de7c33b73c1c77f7ab1abdb5fec414a2a99aa88622f9903d85503f60c364d9
font_01_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 10848 bytes
SHA-256: 9903d24a980c4b1a3a63538272d922215c3709fda590dd760499a1278e0ddcb9
font_02_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c