Malicious PDF — malware analysis report

Static analysis result for SHA-256 77410a9cbfa1d29d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 10:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53658c6f2529a0aded09fccafef8bbfe SHA-1: e8814b5c374a826ef06b77e92f094344e7fabd25 SHA-256: 77410a9cbfa1d29d0ab614f8f9de357c5bb9ec989687a290b9aa2bd811dd76e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to distribute links to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://togul.org/sites/default/files/file/kagipilagogid.pdf In PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/fexitepatukosafi.pdfIn PDF document text
    • http://video-cycling.de/files/file/33080275604.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/48796319289.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/62090044896.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/24347874612.pdfIn PDF document text
    • http://domuran.pl/files/file/nozovibegajuxizap.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kinonaw.pdfIn PDF document text
    • http://centrons.com/uploaded/file/70421653261393d861afec.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/30607702297.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/tekosoxinisexovusam.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161352aa435026---biwaw.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/deganapilonowojiluda.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81036416512.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kovavitunodij.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/nolanazupixo.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/19943377553.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/podisu.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/82502692641.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/pawiwuresex.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904175101323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+phone+restartPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 18004 bytes
SHA-256: 9e9fa47a3f0b13c2e0eb4cfcb425eae03c0a392f9f54f9bb844a3e7aaef61905
font_01_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 10424 bytes
SHA-256: e5e06d6d94a2e7f5beb6c695cec0fdb8083aea09d679827f2d813f0d8a6f11c2

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