Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd91ee99890d99d…

MALICIOUS

PDF

90.0 KB Created: 2021-04-12 17:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fd96f7df166db3a283658e5bc45f46b4 SHA-1: 0f556071500f4c5e25b129780b2e3f8e79ace84c SHA-256: cdd91ee99890d99d371063dce0d9af863cb5a699eb15d9e69b73fe95c7e81741
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 or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://nipisod.ru/strik?utm_term=hot+blast+wood+furnace+instructions PDF link annotation
    • https://webesamogamafi.weebly.com/uploads/1/3/4/0/134012635/3799073.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/iiifIJp/top_songs_of_the_70s_80s_and_90s.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/YsidieQ/jaxikuwuxorite.pdfIn PDF document text
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/0dc704.pdfIn PDF document text
    • https://danisamotaroz.weebly.com/uploads/1/3/1/6/131606121/vugewiku_vofupumajibawur_munutajofolipo.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/zoturarativo.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/1347614.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/78f9a121d.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/CfJN7hg/78194597057.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/lokodotunosarisinide.pdfIn PDF document text
    • https://wavujosivisero.weebly.com/uploads/1/3/2/7/132740585/naviji_mokamik_lizirorem_malirixuxeliwo.pdfIn PDF document text
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/6a3300f3.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/gowoti.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/55873592237.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/Ejhji8s/drifters_white_christmas_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/TGYigij/nagedugavopuribit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedemigu.atwebpages.com/sivewalarizof.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/27087837171.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/71330807333.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/tilofubozaxejuditotebipu.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/pegurokivedanut.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/bitcoin_mining_app_free.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/lefixuwegisesabifuruzog.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_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 5208 bytes
SHA-256: 8463a917c3a67536e6034eed03ea9559ad171c70c469cbde20aac693e16b2109
font_01_sfnt_off000133fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FA 10856 bytes
SHA-256: 2ee2a55b55b7a123e7cb84ecd96b2a8ce00b5657687d941fe3da3ba3d6eed593

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