Malicious PDF — malware analysis report

Static analysis result for SHA-256 9820bbb45b8a1d3b…

MALICIOUS

PDF

73.0 KB Created: 2021-03-04 12:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb7bf8ebe277fd5dc26b7bacda9bb1f0 SHA-1: 9defd79d5572d29e6a048416ec325e3b0b83297c SHA-256: 9820bbb45b8a1d3b31902e4cb990217513d77bd83d2d82c6f41c363fc5551a03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/aws?utm_term=best+bike+lock+lockpickinglawyer PDF link annotation
    • https://cdn.sqhk.co/mekurapiw/qgf7gf6/topegewotenek.pdfIn PDF document text
    • http://complerbnp.com/zifuzozodekefejku3nn.pdfIn PDF document text
    • http://citimart.online/glencoe_health_chapter_23_lesson_1_answers238ry.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/44484438617.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/j1jchaP/mens_longer_hairstyles.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/Xjajfgh/tekejafo.pdfIn PDF document text
    • http://suzenax.22web.org/41350160160.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/gce40gg/rumurapa.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/TRiagfM/korufowotuma.pdfIn PDF document text
    • http://afracheat1.xyz/rofaronevx3pfm.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/Tgjidji/79895629670.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/sevoga/lexonadofedijomejuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/google_docs_sheets_and_slides_for_mac.pdfIn PDF document text
    • http://robogotut.epizy.com/9506615473.pdfIn PDF document text
    • http://lafugigolemetuk.rf.gd/clash_of_clans_coc_ios.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/edipo_rey_personajes_principales_caracteristicas.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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 5548 bytes
SHA-256: 5634a795c5f79c75abb897f9ab4aa13a437ec82e6ba9aae59a6d51911eabcffc
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10408 bytes
SHA-256: dcf37773b243238e39115ea7c68519af9ac5d9e2348f4c36100729920bb8803c

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