Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ff0a119548a2ae…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 19:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34cae0d7ee9cafd86279027385402883 SHA-1: 5f510f4298102d0cf0eb02b31c1f230fcc861993 SHA-256: f8ff0a119548a2ae49ef57eb0cc104ec67bc56088591cb9e2d78874f4f80fffd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=burra+katha+telugu+movie+songs
    • http://notudokebifapaf.22web.org/xl_blood_pressure_cuff_manual.pdf
    • http://vujenixuwo.mypressonline.com/routing_protocols_cisco.pdf
    • http://suxoxaxowigab.scienceontheweb.net/fifufi.pdf
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/580dbdc96364df.pdf
    • http://rixuliketasaban.mywebcommunity.org/hernan_cortes_biografia.pdf
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/pumoxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lonesopuw.onlinewebshop.net/57521218020.pdf
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_c573d77bb3eb4cedb3e650fb61bc895b.pdf?index=true
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_92c0b27bf2b44f91bec9176a4740c259.pdf?index=true
    • http://sisufovofow.atwebpages.com/45741466481.pdf
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_ee7a151151584fc4a16a3be7f34da413.pdf?index=true
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_e91b9120001a47eea630bcf1dcd7c02f.pdf?index=true
    • http://jozazesebogole.rf.gd/vakixubej.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_755a57db5cd34f659fd717e27665cbed.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_c275fb8c5e7b4fcbb8fae25cb6f0c50b.pdf?index=true
    • http://vegunag.rf.gd/xsplit_broadcaster_pro.pdf
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_9cdeab79da9c4ba38374ad5068b14724.pdf?index=true
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_33fb4ba3c5f0417c84e2c0ee6a6ed01f.pdf?index=true
    • http://zetusemikaso.rf.gd/wijefoxi.pdf
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_26ea8296e153426cbd9f3d6c9c9619c9.pdf?index=true
    • http://lizebij.epizy.com/how_to_remember_the_7_gifts_of_the_holy_spirit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f615.bin
6c2e6414230ebc5be06b2819853960aebc1f713f5249e763931f26a5581ff0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 5272 bytes
font_01_sfnt_off000107e3.bin
792374a0dafadfd9d8bf5d9ae73fa233fed4a53e3e6073c76fe1124135fbc857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 11040 bytes

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