Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0ba5237188f1a2…

MALICIOUS

PDF

69.4 KB Created: 2021-01-28 23:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 502f55e4fe732b820209adc50fdff67c SHA-1: 19c349fa9364880e259226c749946795b60fda0c SHA-256: 0f0ba5237188f1a22cc90519e3596500eeb9a84abd38a7571df7a8065712ab14
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with link farming and disposable hosting, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing lure or a distribution point for further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=sacred+heart+catholic+church+lancaster+ca+mass+times PDF link annotation
    • https://cdn.sqhk.co/rewazexi/BOVihOm/81399949619.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ghjahiv/skydrive_flying_car_youtube.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/7411097.pdfIn PDF document text
    • http://svoytrylend.xyz/fukusinajupepikitotmjp5.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/Tqhehca/seduwukazebujif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5fcd6d33a3a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_60129a2870211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fd9d726b97bf.pdfIn PDF document text
    • http://yozi.store/vegobakugenusupusamebo7bts3.pdfIn PDF document text
    • http://infonewstravel.com/naziwaremezepdmdzb.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/lebejos/51972938784.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/bioscope_app_free_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/chitarra_romana_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/best_korean_drama_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/delivery_note_template_excel_format_free.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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 5284 bytes
SHA-256: 508b66b6ffb4b65234c91d8a952609322667ceaa05abf5a84c0ebfec90a2aa7d
font_01_sfnt_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 11388 bytes
SHA-256: fca17273951a60e5100aa7a98438eb8f976ce5552feaf87bca69dbe54e6d6423

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