Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a43b83b08daadd…

MALICIOUS

PDF

77.8 KB Created: 2021-02-16 19:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 31096b0c9d49986cbebaa7bb5dbe3f59 SHA-1: 59939c898c02adb9c0b32bb86387098e8f728ae1 SHA-256: 01a43b83b08daadd768e1e9adfc415d042dfc574f9990abc5f24aba646d4b78b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=how+to+install+my+roku+streaming+stick PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468253/normal_602ab899e5721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5ffa23735b9b5.pdfIn PDF document text
    • http://filfex.ru/algebra_worksheets_grade_7advxq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487626/normal_600063f435dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_600ab6a62df3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_6011b4edab7f8.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/6162244.pdfIn PDF document text
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/5d50ae62ab1234.pdfIn PDF document text
    • http://circulyarkadigital.xyz/68264708134smmd.pdfIn PDF document text
    • http://axecheat8.xyz/pdf_reader_gratis_windows_10q77ky.pdfIn PDF document text
    • http://barbanapoli.moscow/tuvogizikagivol5r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_5fe18a343e752.pdfIn PDF document text
    • http://yellownatural.space/57361159760i1tgm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5220 bytes
SHA-256: 1b0636c64c057f0260b9fd96f232e8ae81cc12baa0c390e73529affb1452bf91
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 10756 bytes
SHA-256: b3d9eb0099f12378442877ea56f1ac1a1c88daade11752fc462b56653ac5d956
font_02_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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