Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cbc0574ec51f49…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 02:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34a9ec4a99ad6af178097ba8c738a769 SHA-1: d475f3e93f99e69e9f00bdc6850aaa146b932c59 SHA-256: 12cbc0574ec51f491850f458b584842d8f1e67bf6c6e18821f80710c15110584
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to disposable domains, with a high number of distinct hosts. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dissanna.com/temp/fckeditor/file/sugafidamaguzawurexu.pdf In PDF document text
    • http://rasmesafar.net/basefile/basefiles/58730376759.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fudoselevalumezoripate.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/darotudoxevemotumitejem.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/zulonadokewodawufegeje.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1af69ddbac248a454413313e8c1ddd4a/35677607008.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/1969694598.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/lovavojoditoza.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/jujafamepodagepisil.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/38402476579.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/pesozodezimomogorewir.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/zejodokapupolezu.pdfIn PDF document text
    • http://chieucoingason.vn/files/93494281014.pdfIn PDF document text
    • http://cke.hk/userfiles/99468242863.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vabup.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jegigajegorujuranofiz.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/pizokol.pdfIn PDF document text
    • http://kes.org/upload/editor/files/duwez.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/89910052720.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/56402506728.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/ragiwegaxebaxije.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/xewozadibivoke.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/sunanosinamip.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bc994a07---67707726796.pdfIn PDF document text
    • http://talesma.com/E/file/37472432010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+gun+game+2PDF 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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 17100 bytes
SHA-256: 33c7a7429470e4b2e3b75a4b0f5088e65d4a8997ba8a243edf12a981738702dc
font_01_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 10112 bytes
SHA-256: 631c1b6d1ff473c2bbb6b7840293f3837505af06a8886cd2d4b553630f48d40b
font_02_sfnt_off00012545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1