Malicious PDF — malware analysis report

Static analysis result for SHA-256 054fb0345e90bc33…

MALICIOUS

PDF

87.0 KB Created: 2021-05-08 23:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 937c6845f74457839a0492a17df3b406 SHA-1: 238f5e2e78c4e801acfcde564bff1caa50e1789f SHA-256: 054fb0345e90bc33bb6ccb30b4b79f981d78010692609d83c4e22734270de1e1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=are+marantz+speakers+any+good PDF link annotation
    • http://deflecfcvy.best/guzed80hag.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/35245937850a5eu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469375/normal_5fc8b634d3718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_602b96c3765e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_5fe911ec1a439.pdfIn PDF document text
    • http://mon-cmso.best/badland_mod_apk_revdlfaatr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_60579e50f2cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_6042e06f711b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vunizi/where_to_cracked_mac_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15b578c-bfc9-427b-8be5-10e15571cfc6/worojanuwagiwejetiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d0a652-6f7f-4d53-b66e-45b3ad7e4489/44128654914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01932509-6bf0-44db-9bcc-04aeea30cd47/96_ford_ranger_xlt_extended_cab.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_10cfc1e6bfc647b3831754eb83623371.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ratixifo/50257383334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc7431d-83b6-414b-a7b7-39f40f73cc74/primeros_auxilios_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262c9914-9fd7-4f3b-8848-5d8e622e558c/the_great_depression_drought_definition.pdfIn PDF document text
    • http://velevemi.epizy.com/boris_cyrulnik_livres_gratuit.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/how_to_calculate_the_volume_of_a_compound_shape.pdfIn PDF document text
    • http://xegiwofune.rf.gd/88541334825.pdfIn PDF document text
    • http://tibobabinenan.epizy.com/11988578044.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_ed706062c7764f479bfcc594b0b63cf7.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_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 5452 bytes
SHA-256: 567848836d1b3620d590b89e7bd09986c35ba355abc5a4f92e76b51690032317
font_01_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 12044 bytes
SHA-256: 1cc4a674c8b2a959a61b6737b6ff982b0634cc62707f47f9e84e34353f1a269c