Malicious PDF — malware analysis report

Static analysis result for SHA-256 5329c643afa19cf6…

MALICIOUS

PDF

74.1 KB Created: 2021-03-17 22:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2647abb8a0a2063c04f8f023c55b4f3e SHA-1: e0139ff9814655b9c1da558dfbf1679a68459602 SHA-256: 5329c643afa19cf671a69de5beb3ef2632bed3ce34c424756b714381a3082190
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+pair+fios+remote+with+roku+tv PDF link annotation
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/6372b24.pdfIn PDF document text
    • https://rubovumalez.weebly.com/uploads/1/3/4/4/134458479/f7a73e15d5ff80.pdfIn PDF document text
    • https://xunujigunabiwuf.weebly.com/uploads/1/3/4/0/134017077/vogepafobopusevusa.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/lixotunadewepidaf.pdfIn PDF document text
    • https://noxitituruvid.weebly.com/uploads/1/3/4/9/134904787/padekugotukub.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/2421fcc36.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/zinevadubemun-pineka.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/7414862.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/f72215d36.pdfIn PDF document text
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/kobokowusudepak-zofujutu.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/ff70fa8f-3c57-4ac4-af3e-b69518d1c859/john_deere_lawn_mower_parts_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b279d07d-54b7-45b7-96a0-3c1a8cad1062/realistic_pencil_drawing_tutorial.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_e738fa1eb4bd402ca30a4bfed09a0585.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0311aca-8342-4eee-a704-25c7d703869b/68263947757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd12a007-8ba6-4bf8-a40a-6bfae13ecf12/c_programming_book_by_ajay_mittal_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a07a83-95bf-45f8-8ff8-62261f46645d/6702458725.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_8d36fe9dafe649e5aab047bf8a922345.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5288 bytes
SHA-256: e826f7f66b3822b6fd7a1c3075034899d38ce88bd80c64a85e966a14529398c3
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10316 bytes
SHA-256: f0f4a2aa80f854c6a20c4c24aecfec8e10c47ee5a75c2d7522f9768b91a8cd5a

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