Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75bc1c26bebff54…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 12:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa98090db39c83d327740d2a19f290d7 SHA-1: 6d87265ec06f812d58e5fe45bc4d865bcaf42f0b SHA-256: e75bc1c26bebff54658f264c1d18c769e18c1de3f42de0e37c79754799e2aa95
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://oniceh.ru/uplcv?utm_term=cricket+highlights+online+free PDF link annotation
    • http://vetsnab32.ru/userfiles/file/pibog.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/bigevezupuzemomumu.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/gebiwifudupozewem.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/powano.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/dukusupope.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/lusilepozefuditot.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/majugusamekinudurix.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/12202574993.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4a270663---fikekibipupamabafexibopij.pdfIn PDF document text
    • https://tivicom.vn/upload/files/fepinegekutemijopoju.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/widozarapasugasone.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/92057508820.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/3392926791.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/83588830603.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/fetimebulonerenupukow.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/gobigutevewaw.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/kobemalusivaxuvanukota.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kilusenarog.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/36091941499.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/92980389169.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/donerawewixi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ff59f40f4---vulog.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_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 17424 bytes
SHA-256: c8636eff7cebf020ed862d5355c68370aa46b553836315e40adb0f174a27ceed
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 10576 bytes
SHA-256: d0c746d3eed5a243c2b55ba439d8109e8b1421cb71166862ed90fe25e0ed185c
font_02_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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