Malicious PDF — malware analysis report

Static analysis result for SHA-256 040861e49d597d5c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 08:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eca3511da9486c473d2127391e3ca0df SHA-1: 0333129889eab8e5a7b4520cd4a598e1d4178bbf SHA-256: 040861e49d597d5c1c8d60def983890182bd98b19a63f2cc844fd1fff9c733ab
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=dark+knight+tamilyogi PDF link annotation
    • http://naplesredeals.com/userfiles/files/56113415171.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/nemikifujebi.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/kigogugiride.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/fejijoxigiwezewo.pdfIn PDF document text
    • https://esvigo.com/upload/files/61170640447.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210912060103.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2353e086---sopapapimafiz.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/82152619295.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/71789266025.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gobosojelaxuxefa.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/96594621076.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/49734913604.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/87709062733.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/vibabolara.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuxevapuj.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912104957926486.pdfIn PDF document text
    • http://laduses.nl/image/file/82946538764.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gibugususutitomizemol.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/kaxonujezawemor.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/37670089097.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/fizugowawozenodejaxoxu.pdfIn PDF document text
    • http://shesob.com/file/files/bituvekojojetepod.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_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 10460 bytes
SHA-256: e472276d94dd1e734522d589ce1d758d24accbae130d32175e108e18bad5ecf9
font_02_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 19272 bytes
SHA-256: 23ed8b8048bd953b63b0baf6c5d161540dd1fceb1e5ac01b0bc3fb5bbdb60346

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