Malicious PDF — malware analysis report

Static analysis result for SHA-256 479d6f3123e62147…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 01:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5b55901e794c0e34c4355e1979b0c1f SHA-1: c0e6f5dfa067f1d7e24263ca89d27a54a9fac567 SHA-256: 479d6f3123e62147aa71a224693a811bc22fce2abe18870555d4b799358e04e0
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to manipulate search engine results or distribute content through a network of disposable sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://yoimart.com/upload/file/20210908180454.pdf In PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/666975792.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/nedezupatusuvazejifanot.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/jufipozafima.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ce24db1992feb854825b997de892c777/wegaboviti.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/74048973677.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/67573630917.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/xojoruzup.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/43050664586.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zozepirojofes.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/liritaxubokufad.pdfIn PDF document text
    • https://e-room.co/userfiles/file/supogafegitiroloxusuxe.pdfIn PDF document text
    • https://adikketiga.com/contents/files/jozajif.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/67401385197.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/vajod.pdfIn PDF document text
    • http://analhospital.net/file/files/82352926720.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/vekomogimak.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/91617774314.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/sipor.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/40529407965.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/taxojapuro.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/52871025883.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/50323378966.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/bokeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+4+mod+apkPDF 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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 18420 bytes
SHA-256: 0fa8fa14c8a8b98ae6490cb5c283f98fa9c578c45b968c47772e3f2400879681
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 11036 bytes
SHA-256: f7a2a7a41d1783b01cf69eed1fa6f28bbd36e877b79fb3c6a4d2606f9d38fac0

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