Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6889b50edb7078d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 21:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4c249fe882189e5d36a795f6ff377e70 SHA-1: b85e0eca018cad876b1093459ca1d2815415e141 SHA-256: f6889b50edb7078d87c025a289e9035555a12067564a2cc95bdd2b81362cb92a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL, 'https://baarspo.ru/strik?utm_term=which+programming+language+is+used+for+android+apps', is the primary indicator of the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=which+programming+language+is+used+for+android+apps PDF link annotation
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/7611507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5fff32d7c0a56.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/ahbLgca/overhead_absorption_costing_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_604a3c5cb0165.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/fufedimadutabige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_60148122d3b05.pdfIn PDF document text
    • https://cdn.sqhk.co/sawusuzi/jicibQ2/30744954872.pdfIn PDF document text
    • https://cdn.sqhk.co/biluvetizom/Lhgiahf/44584016039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_6001528d2e7dd.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/6f1e82b5f.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/komajezogaxotakapuku.pdfIn PDF document text
    • https://cdn.sqhk.co/milatepoz/gdmEOje/2723710586.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/jhY4OEw/difinipanusonexevesopavig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_60627accaeb1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5fde35703e000.pdfIn PDF document text
    • https://jozugirizozixus.weebly.com/uploads/1/3/2/3/132303278/jedelivadoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_573fb28619654ad7b450f873ff8b2c1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b26fbf3-df36-4abc-8014-53921ef69e4a/10520133422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdb2f15-2d1b-4bf2-951e-933fe43aa7eb/14348780782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6111e8f6-1aa5-4d25-b184-1d846ae8e527/how_to_measure_plaque_index.pdfIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_89e1ba1057aa438eb08f70a00d08dbf9.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5580 bytes
SHA-256: 3fd9a250724dd3bb0e3d8f2bcf6ba604a318914860d112b65c358a415bb742cb
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 11860 bytes
SHA-256: 1b7a06163c964a1af06cbe2786c26fe8fb4bbd42c53a26448129a88d5f2dfddf