Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b5959d7a4c5b0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 06:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 385015e7061a979141bd73dfee91a4c3 SHA-1: 1aefa4bd70101f39ddf87b86f0524f9dabc7e4bc SHA-256: 984b5959d7a4c5b0492127a89f2c1d49cd8fa194c4097c5ffb13fb9827083513
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for SEO manipulation or as a distribution point for other malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://silver1979.com/upload/file/5147719566.pdf In PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/47472010387.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/jobosalemanenadokux.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/99894504062.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/zenuvalopis.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/gizadazubevavugupar.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/mukopenatuxeriwikiletug.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/99006476928.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/juguniwenebarukuj.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ju9hgkas45k6dufg48b1cum1g1/76499126163.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/tumaxa.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/mumomig.pdfIn PDF document text
    • http://apsons.eu/files/file/47487877989.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/24137175137.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/28313487652.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/tixodapalagonelovupu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/13/file/20210913_005841_137.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/fevadisapivutebofutoguf.pdfIn PDF document text
    • https://parc-hotel.info/file/nefesenalegekar.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/68649662918.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/gixexugeg.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/fifoninetipezafotokavub.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad45377e0---40144833569.pdfIn PDF document text
    • http://askaudit.ru/price/31402364325.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/ponevopofinat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=side+scrolling+mmorpg+androidPDF 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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10836 bytes
SHA-256: aa41873057cd5e658db5ebd68da7d2ffa86ad30002a389158f827f87917d2ca7
font_02_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 17336 bytes
SHA-256: da6c9614d857e1260f1c42af2bec47eb6ebc437e26fb82f7bf3aa2881e5d0faa