Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97eacd288ccbf3f…

MALICIOUS

PDF

76.6 KB Created: 2021-06-09 09:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b49b1b86aa9830dd542c3ebe21a42dcd SHA-1: 0d4990211af65b3d3f516541c478fc0155e056e0 SHA-256: b97eacd288ccbf3fd11285c7bbe1c9dda0e44d9fd7f18def8bc55e178e0d57e6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URLs, particularly the one pointing to 'medvor.ru', suggest a phishing or malware distribution lure related to a 'mac os x catalina usb installer'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the document as part of a link farm hosted on disposable domains.

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://medvor.ru/pbw?utm_term=mac+os+x+catalina+usb+installer PDF link annotation
    • https://pirowefe.weebly.com/uploads/1/3/4/4/134444143/8837135.pdfIn PDF document text
    • https://jawebufor.weebly.com/uploads/1/3/4/6/134647112/7084445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_6010f814b9f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_604e86fd5bd48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_605266960522b.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/66d7a21980a81.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144432600/93093920908.pdfIn PDF document text
    • http://vinivat.pbworks.com/f/kevupisajarowifujom.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/80118473752.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/tudomo.pdfIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144601842/suzufagidijatunimajoxedog.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144535920/capm_exam_prep_fourth_edition_rita_mulcahy.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/orange_county_ca_ccw_good_cause_statement.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/tujowapivigizipinojefo.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/malayala_manorama_weekly_old_novels.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 6168 bytes
SHA-256: 0e87cd05f332aeb2a72b3daf131c0310eff8a4a40b86507956a7cca2f5d1d305
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 5004 bytes
SHA-256: de11d6050a9fd685292ce0b2aca7286638913671bd52f3171ca7ebb5dd861383
font_02_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 10956 bytes
SHA-256: 5d55d972341a82c75999a2f283a7ed73b23c60a1394026311e4ca006a6354c1d

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