Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1088b2f9c9b2b0e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 23:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bee3dc3423157bf20ece5c6ab1ac84fc SHA-1: 404e9d16cc18a560cb0446f5bf6da146747fa6d2 SHA-256: c1088b2f9c9b2b0ec6e317fc37e0ce429c5e59f8dc1220b2aa73b811724bd28b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=vod+iptv+apk PDF link annotation
    • http://waetsukai.jp/system/ckfinder/userfiles/files/tojamunekeka.pdfIn PDF document text
    • https://terracell.pt/images/file/xulunoxiv.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c851f48437---vonofe.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/zezadosajus.pdfIn PDF document text
    • https://isosklo.cz/uploads/mikabozumajepupavuporu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/jasezekusin.pdfIn PDF document text
    • http://marketingnews.fr/images/file/30338800340.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/gomusepajo.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210920_ED3A8AD303DB1E76.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/jelowuxufaxasedawi.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/26692324264.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7ef43e13f901018c5f07d5e84348bd21/joxela.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/7051490967.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/negiwizawisuxiw.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/53496682601.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109031617173117.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/ditufa.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/95685296040.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/pejoworamezuba.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/15043762633.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/ganiduzejelofuxotimoxalas.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210901_171054.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_off0000bd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 9960 bytes
SHA-256: d04ba697ed32f96617224a392cb6dccb4ed84e1d1a32c110a442a301b97b076d
font_02_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 16816 bytes
SHA-256: 70d13f55fc97b6f604222c0a4bf3aef7061c1200785484f90de2f54354bc8177

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