Malicious PDF — malware analysis report

Static analysis result for SHA-256 425f94153b3d5cb7…

MALICIOUS

PDF

71.8 KB Created: 2021-03-06 10:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: caa8b2b1ae8ff57fd14ff8a3e628e3ee SHA-1: f525e77c65eed01573f630eaaca4702eb420bb1d SHA-256: 425f94153b3d5cb73dcb3f138ada9b98d6509f2066fcc2c26fbeb7c0b8a47057
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or malware downloads. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/wix?keyword=dr+alexandra+de+sousa In PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/kapepidupipilotor.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/gexafakibawozo_puferefoninurub_watoxilata.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/dggyHKW/vegetable_slicer_chopper_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/hhid6hg/carson_wentz_injury_report.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/nunodobamo-vidisarawowan.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/70phjwD/my_verizon_wireless_cloud_login.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/pavamo_segozume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_60141a1a87378.pdfIn PDF document text
    • https://revivumusemob.weebly.com/uploads/1/3/5/4/135400225/fanasowemoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd128e6cf8b1.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/fevigipisof_zenikimuzisutop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fd7cf1accd64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fe30765a9840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_603e573d9d486.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/jinotugiwomo/ebanel_korean_collagen_facial_face_mask_sheet.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_570e6f2d0cfc488ca1d2374ca3a8e8f3.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_efb177fd50354fe39052501a6a8837d1.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_95fee7df61b14e65b30b65089fd51900.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/fafedajadema.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_3a6b71deb6d9466988cf612f958cd262.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_747cda7dee7847349bba251b055bbd51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sikuva/7197251899.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 4888 bytes
SHA-256: de89fb1f69cbf213c7547b114bb21a1e33e05d151fc4df1c7f047a15d96d96fa
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 12236 bytes
SHA-256: 7ac08bde56085e3e7f60ae73e77e432e8b67bd992fa467a6fab051c566530ff2

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