Malicious PDF — malware analysis report

Static analysis result for SHA-256 02977d9d5617abe5…

MALICIOUS

PDF

83.2 KB Created: 2021-05-16 09:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 69c91f902456cb3ec1aae30a59e45ef4 SHA-1: 64de7cc2160cb8c9f310c76201f76f53c005a68d SHA-256: 02977d9d5617abe54d35a40ef6ad08b6b46fb9f13d3e0b51fc51c6818c4e8e2f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to redirect users to phishing or malware download sites. The ML classifier and ClamAV detection strongly support this assessment, flagging the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=we+should+all+be+feminists+by+chimamanda+ngozi+adichie PDF link annotation
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/kepabizokuwaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_6036f33d55a09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5fe531858f72c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ff4f89ec4b27.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/busalelizov-gogamesigo-ribenul-lukalodoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_602e21c32db30.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/33125159263.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_open_paint_using_run.pdfIn PDF document text
    • https://gijesilikisuzid.weebly.com/uploads/1/3/2/6/132683000/tulowos-tujatobavore.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/8872fc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5ff98701898be.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/f09b28eb-7fb7-4290-ae48-dd3d4a6e5009/64839329676.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/berawalisanosevegewajes.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_5e8b3f6730a443509eeef7daad21e87c.pdf?index=trueIn PDF document text
    • http://vujapoguxesak.myartsonline.com/74038360508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da372ed0-bb52-46bc-ac8e-b40c30dcd00b/vitasazodigexuwizuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a26d31-9309-4dc1-bd1b-d54f2ebedb8b/39462974326.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/alpha_chloromethyl_chloroformate.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_8cfa8f6bd6f646d29e9a98f8e2efa5f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/cisco_webex_room_55_dual_installation_guide.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_3adbda37df94402cabcb8125a165ddfa.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 6516 bytes
SHA-256: 816fa4db58dcb6d9f0444abc23004bd88840635fb123f8b94425eaea5dd92898
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 5644 bytes
SHA-256: 7bd75998766c9d81e5cac74560090d3b17f94183f59a0b6fb3539c822a4a819f
font_02_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 10844 bytes
SHA-256: ac7d67cdbfd09f608b275c6a4c8c869b94ed01f63b5324b5f4a8857f46823536

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