Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b99db519352296…

MALICIOUS

PDF

72.6 KB Created: 2021-02-06 23:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cb1fcbaef4fe35aba3e73449ea34e4f5 SHA-1: 8c48588dca3d383f17ef50d4ad85bb184c325ec0 SHA-256: d2b99db51935229697b4c26a021e7130cc45bdf08413548630a59fe636a388ae
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic point towards a malicious document, likely delivered as a spearphishing attachment.

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://jottigo.ru/123?utm_term=victoria+secret+aces PDF link annotation
    • https://cdn.sqhk.co/gabazumad/hjfH5jc/63992579469.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/4jhXEhd/5522865025.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/ejhrhOD/xesaluzo.pdfIn PDF document text
    • http://fumigatoff.online/torapemebakojogezozusejedl9ic.pdfIn PDF document text
    • https://cdn.sqhk.co/farosexuto/MNifMHd/webexefugamifix.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/ijQ5hjz/unknown_fate_gameplay_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/ep0ghiI/guxenusupewavi.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/Qhihejf/9655447911.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/2yWblzf/joker_ringtone_free_download_isaimini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5fd810740dd8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_601b2cce9963d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://varewokumozikon.rf.gd/sap_basis_book.pdfIn PDF document text
    • http://totaraxidob.rf.gd/lalozibodokuxizovesazo.pdfIn PDF document text
    • http://ketanuviz.epizy.com/24055278777.pdfIn PDF document text
    • http://tedonipevafipe.epizy.com/camp_out_vbs.pdfIn PDF document text
    • http://jugefewaxuxuf.epizy.com/jitufosefe.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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 4728 bytes
SHA-256: 9581562cef4effbe29af2396fa0a971843cd3cce17710135412b1e66f1fbeaea
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 11360 bytes
SHA-256: ed1f2126244fcc3d5458b07fb9e96d16db63d4b416fc2b7f7243f5ebd25a43ac

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