Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670ea4b3d43e522…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 05:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7f2c82902b8fdf3b00b20bc8595f94a SHA-1: 5e8839610b15c8d400c5eeba0cd8855287fee2f0 SHA-256: 6670ea4b3d43e52241ae51325ffc0b5d5e74b6a10069da374ef5a0de9c0a64b5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the nature of the URLs point towards a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://archism.ru/uplcv?utm_term=five+nights+at+freddy%27s+free+online+games+no+download PDF link annotation
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/83610271774.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/65164591790.pdfIn PDF document text
    • https://yasacompany.com/upload/files/28190131583.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/zawepajata.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/71639273657.pdfIn PDF document text
    • https://www.confirmedtour.com/files/43300939639.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/34476816912.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/notugepegep.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614288968d2b4---vejufekixawugijugig.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/mutusegedipafiw.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/91438300904.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/90073453703.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/fulebapikidoduwepesi.pdfIn PDF document text
    • http://heizler.hu/files/file/2944081200.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/revobevusopubodut.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/91314241205.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-1/20210901063739134097.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/tavugunajeriwigawo.pdfIn PDF document text
    • https://orrizon.ru/images/file/bibuwuwamiraluxut.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/27955594975.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/16090793321.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/jokepuxavujekososativi.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/47275411608.pdfIn PDF document text
    • https://finliz.lt/i/File/didekawab.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210904221119.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/89824873030.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 17772 bytes
SHA-256: 2910bc97c8c508f1db19086eef75d92c4f080cdf8863015341b3ab4f91586c4b
font_01_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 11076 bytes
SHA-256: 986453f13b395ce338c90887492b5069072559278ae6eab32888364fe96bc069