Malicious PDF — malware analysis report

Static analysis result for SHA-256 527a6c11fdff84d8…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 06:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b8ef111d3b45824d8a1c9f0726eb72 SHA-1: 194068d5c770dca1d7fcf09063ab137922ea79d1 SHA-256: 527a6c11fdff84d8a9e766ad49baf4787b3ee2e6c67ea0d0db2536e5a6dee106
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to PDF files hosted on link farms, suggesting a coordinated effort to manipulate search results or distribute malicious content. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=what+is+data+mining+in+banking
    • https://cdn.sqhk.co/zikonidenijo/vmvyhhi/23602199368.pdf
    • https://cdn.sqhk.co/temirikuji/bgiItha/5203048401.pdf
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/fcbf086.pdf
    • https://cdn.sqhk.co/konosoka/0jhfMji/grandmother_gifts_near_me.pdf
    • https://cdn.sqhk.co/xivovido/hhcBQ1D/wordpress_admin_too_many_redirects_ssl.pdf
    • https://cdn.sqhk.co/fasotaluvose/RgjjjaA/art_therapy_license_nj.pdf
    • https://cdn.sqhk.co/zopimoforaja/hQjagfu/siwafezutajada.pdf
    • https://xonugovelixef.weebly.com/uploads/1/3/0/7/130739086/felebijurofubikav.pdf
    • https://cdn.sqhk.co/miwiwefe/iaP0jiz/kokosugelagazo.pdf
    • https://cdn.sqhk.co/sabumijobude/gitgegi/nikale.pdf
    • https://cdn.sqhk.co/lumozupa/f1MrghY/atlantic_city_electric_medical_form.pdf
    • https://cdn.sqhk.co/munuluxel/vjeibb7/besazapenulu.pdf
    • https://cdn.sqhk.co/gesafafo/hDmT8Cm/marco_s_pizza_bowling_green_kentucky.pdf
    • https://betetitowuti.weebly.com/uploads/1/3/4/3/134331261/zenasopeloxap.pdf
    • https://cdn.sqhk.co/samumosoxivi/bgghafA/men_s_business_casual_fall_outfits.pdf
    • https://cdn.sqhk.co/vixonafom/fgJghjf/lakebanibebemav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2eb7e4fc-55c8-4796-a485-3003c1dfe58b/how_to_reset_polk_fr1_soundbar.pdf
    • https://uploads.strikinglycdn.com/files/ba7e18b1-ee5d-43ee-a4e9-febe092ef1c9/15706744304.pdf
    • https://uploads.strikinglycdn.com/files/f6e05bd3-cb7b-4ee5-afed-58d3fed5cf9d/98894304173.pdf
    • https://uploads.strikinglycdn.com/files/26a9a719-f770-4c6e-88f8-1838d4ab7e29/busiwigop.pdf
    • https://uploads.strikinglycdn.com/files/bff56ca3-7834-45cf-a82b-15295d34c13d/thermaltake_core_v1_weight.pdf
    • https://uploads.strikinglycdn.com/files/0c3ec0e3-0275-4b1a-86be-f9ee756044f2/12710982266.pdf
    • https://uploads.strikinglycdn.com/files/86f014c6-443e-4a57-b5d1-9be352c39c6e/xikalusegevodenopukibu.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_off0000fd82.bin
8da669df14a71bb6c294a4eeb2fa582a24ccccd2fe7cd633aee11d14f373877c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 5328 bytes
font_01_sfnt_off00010f86.bin
e9da5643b213ab3eb0a472feceafd87e016d0b96328c867819c9e00f2f473800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 12816 bytes

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