Malicious PDF — malware analysis report

Static analysis result for SHA-256 971b51baccadb69e…

MALICIOUS

PDF

68.4 KB Created: 2021-03-24 03:25:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 844f4aa35d547faaa1cc51031e0dea90 SHA-1: 2482077cbf2fe6495add499c6c1f9d766544697e SHA-256: 971b51baccadb69e13434d5f08fb2331a199fb2f029a6189c2e21e4b478eb629
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many hosted on disposable domains, and is flagged by heuristics as a link farm and a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

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://zajinet.ru/strik?utm_term=how+to+put+amana+washer+in+diagnostic+mode PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5fca3748e6f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_601f5e2b50e94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5fc5caaf30456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_6018338cbd36e.pdfIn PDF document text
    • http://timurberg.ru/how_to_lose_belly_fat_yogau15qd.pdfIn PDF document text
    • http://metaleagle.ru/high_volume_portrait_photography_lighting_setupaas3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fe6f7d819331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_60341c419de5f.pdfIn PDF document text
    • http://revershjtb.site/porter_cable_6902_router_reviewmqf8u.pdfIn PDF document text
    • http://mybatut.store/the_escapists_prison_escape_apkpurenz8tr.pdfIn PDF document text
    • http://ledy66.net/52635556102uz9x2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cc0b0a-d974-4900-90ba-76963016d333/bhagavad_gita_chapter_2_in_tamil_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18699da9-8cdb-4489-88e5-d7257f430e57/52932524820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c846d29-f31a-483c-ae95-c575980d26c4/technical_analysis_of_stock_trends_11th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d7239f-8b3d-4659-b30d-c6cbde4d7f10/67564045550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c27530-ea36-4d90-a96a-802cb466f47a/67236058374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bab3a35-6ded-43a8-b7e5-74de370a3fbd/g_shock_mens_watch_amazon_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0c4dcb-4dfc-47bd-8cb5-1766396d74f5/luzavefulejopuz.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_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 5508 bytes
SHA-256: 2efed79f0bf1ab8843e89a85add394721bb9c11cc01649032a2474040ff32bc8
font_01_sfnt_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 10412 bytes
SHA-256: fd97829d664657a3ae73f5f021d440406091299d05b3458bddc359099200e8aa

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