Malicious PDF — malware analysis report

Static analysis result for SHA-256 3519ed5284fe79c1…

MALICIOUS

PDF

80.1 KB Created: 2021-04-08 02:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef4bfca90243b06468ac6f01ec7fd075 SHA-1: cce31e2ff2c2ae8ad62c87a26f82d97e6a4eb006 SHA-256: 3519ed5284fe79c1b7d08e03a2618e44bdb67179aa32a14f79fd69af766741f6
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting, and one prominent URL related to trading. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=how+to+do+trading+in+robinhood PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5ff08db32249e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_605b1f08378fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_602ed1515f22c.pdfIn PDF document text
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/zigiridupuxoj-bexazigope-jataxod-kipodaxav.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/dezepulefaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_6041c5cf5ee2d.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/zawuvadut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_60124f06def41.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/76983365700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5ffe2f8687db4.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/lepavawe.pdfIn PDF document text
    • http://watogoda.mypressonline.com/455033263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452594/normal_5fe5398f37798.pdfIn PDF document text
    • http://vukojekan.mypressonline.com/narivalekijed.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/437054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_606ba050bed9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/mapasabezefiwiputen.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/case_study_method_in_research.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/25078923049.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/horizon_zero_dawn_data_point_guide.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/12200204173.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/banujirikarezotunizes.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/3880768753.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/61969771965.pdfIn PDF document text
    • http://vunonam.atwebpages.com/tom_sawyer_book_by_mark_twain.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_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 5068 bytes
SHA-256: ebe6f8df1f85607f867157e77cde151c749a1f4fd3359769517604aa186208b7
font_01_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 11400 bytes
SHA-256: 4b4655d3898bda443f8028b824ca4f64203cb4bf5b6f03630c9249f7e760137f

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