Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81e173beac344dd…

MALICIOUS

PDF

74.5 KB Created: 2021-02-28 07:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 68cc0a9bc12296d548049cee82d4481c SHA-1: 998d9865a0319cd40f182fa846e7ffe1a9eddcb4 SHA-256: b81e173beac344dde6a9ff584a1ca165821bf13f06143f9384cbb8cee7e68fcb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or link-farm-like services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/wix?keyword=chapter+1+introduction+to+psychology+test+answers PDF link annotation
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/3f537e2156b5c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_602fe45c12f0e.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/zitamipi.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/akhevjh/marvel_contest_of_champions_hack_without_human_verification.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/samsung_8.5_kg_top_loader_washing_machine_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fd7b8a9d24b9.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/hhdOIhc/pevepejatunijom.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/dsc_832_clear_trouble_light.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/86065803102.pdfIn PDF document text
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/xugisefef.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/NueieKS/19420728604.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/569928.pdfIn PDF document text
    • https://rupubonu.weebly.com/uploads/1/3/0/7/130739332/nosemaritukalokekiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_6008d2513222c.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/60986856144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_5fe9577d7f024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/types_of_chemical_bonds_worksheet_answer_key.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/wristech_blood_pressure_monitor.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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 5484 bytes
SHA-256: 7d3083fa58a01d60dff6e3d2cd4a5aa1b42a71b42751ff5a2d0be8d02da7abf8
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 10108 bytes
SHA-256: 75d5651436c838c85cf6cc82d728ac400e2a0fc86f605cc28b240352fca0d3d7

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