Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2506a00887c4d1d…

MALICIOUS

PDF

81.3 KB Created: 2021-03-15 03:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 24e7b84000830b9a8e788a89fa0ccbf1 SHA-1: a306cd6f3c21e515e45e56d6517c36e0a22d8a2e SHA-256: a2506a00887c4d1d5832d4441cf75a592c2d796507a5edb0ccba64ff3f7e94e7
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The document acts as a link farm, directing users to various disposable hosting sites that likely serve malware, disguised as a calendar. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/award?keyword=calendario+2020+para+imprimir+pdf+meses PDF link annotation
    • http://itfamily.pro/31526225745a2lx8.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/dibhcF6/31465492748.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/BiehgLJ/28887156252.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/dgdhbNy/64797088714.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/XHichjV/9859688847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fd1778aecfc2.pdfIn PDF document text
    • http://itawegan.fun/830605070533vp4y.pdfIn PDF document text
    • http://artemk.ru/kaukulan_ng_panghalip_panao_worksheetswrwha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_604deda27cebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_604173ca9f33e.pdfIn PDF document text
    • http://masito.space/49301072808j89p8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_600da7a87daf4.pdfIn PDF document text
    • http://true-board1.club/82643194074cdfx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaleponijodo.epizy.com/piluweb.pdfIn PDF document text
    • http://bajaxugezozego.rf.gd/jesidebamitolabupagegalez.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/pubojinifawawufodosamif.pdfIn PDF document text
    • http://zajegugolex.epizy.com/droit_d_auteur_informatique_dfinition.pdfIn PDF document text
    • http://suvumudupese.epizy.com/takogapupufefubokeb.pdfIn PDF document text
    • http://neduweleviwov.rf.gd/86521283833.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/boiler_testing_report.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_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 5364 bytes
SHA-256: f50c8933562b4590f3c377a47062932c52d719047599024df2e348a73d63e05f
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 11516 bytes
SHA-256: 6db54fb66681bb2da850c68b9053219c285c47e3c13c24e441e59b30949a39b3

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