Malicious PDF — malware analysis report

Static analysis result for SHA-256 7822ba53874d46e7…

MALICIOUS

PDF

76.2 KB Created: 2021-02-07 04:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 75fa1631d66e501221053b7e3ba440db SHA-1: 0d2af824988103fb1daeeff7dc96c710ee8b0013 SHA-256: 7822ba53874d46e740cb73f7ffada144a6b7811d288c5d89383975d53672494e
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to direct users to external websites, with one prominent URL being https://baarspo.ru/wb?keyword=kindergarten%20counting%20worksheets%201-%205. This suggests a phishing or scam attempt, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wb?keyword=kindergarten%20counting%20worksheets%201-%205 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404980/normal_601937e648b96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483842/normal_60087c229ec27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405440/normal_5fe0c0f628e3d.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/jeXgj9l/family_pact_application_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462035/normal_5fd85b2502a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_5fd8db4da7c7f.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
    • http://simivejed.rf.gd/free_printable_lesson_plan_template_blank.pdfIn PDF document text
    • http://reratosagozi.rf.gd/mepedunes.pdfIn PDF document text
    • http://zexubadisaki.rf.gd/68738961937.pdfIn PDF document text
    • http://vububogux.epizy.com/52176840782.pdfIn PDF document text
    • http://vozotokunu.rf.gd/69870267688.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/43824019442.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 5384 bytes
SHA-256: 3775fc4240a448ad5bae452f6d28ab3771d681a2489744f9ab84ad24fae156eb
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 10728 bytes
SHA-256: b13317a78a242f2f609b976c63caa5ed00233a4a9e00379d703aebf4f314c322
font_02_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.