Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b598751a7bb1787…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 10:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc02b730a99364edea27fe1d42e88ddb SHA-1: ae50365f0f524d19d41159f3d9c87fe62c44ff63 SHA-256: 5b598751a7bb1787fd169058cf96c30d19c597d22b138c045115679917c86261
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=android+versus+ios PDF link annotation
    • http://quangcongluc.com/upload/files/bofoxumajoditeti.pdfIn PDF document text
    • http://centrons.com/uploaded/file/852154185612ec01db6397.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/zaxuvisovapasudomugeje.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/72433519080.pdfIn PDF document text
    • https://mihalex.by/files/files/mabibuzafasemuj.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wudimo.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/29382839917.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/lipatisuvo.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/gaxex.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/65695898662.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/fidopabefezewoz.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/4795398935.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210911_E51771E7F1F7C649.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/70360229921.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/26353295663.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/54955463613.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/nixaromidivet.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161407d1693e85---58808402464.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/mogabidow.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/95246235621.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/sepijarelo.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/zenobozodafejumuw.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/domuzofirakujujoronofo.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/92118474727.pdfIn PDF document text
    • http://aweibel.com/Photo/file/nalabajen.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://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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 10084 bytes
SHA-256: ac688755c91cbec1fcd3d662a35dcaa4933c741e829243f3d9a77c6c026e2b24
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 20176 bytes
SHA-256: 0985713d3cd882f79a43325e784461ec1dca9386da55288bca7712bcff48a6cc
font_02_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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