Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c935b3d50a2c538…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 16:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cac54e49a1a98ecbff55fc660fcc56b2 SHA-1: 08ed65dc8fcc013b63697309c61e1c21cc026ae0 SHA-256: 6c935b3d50a2c538563a28bbf0f83c7ce92e6ed1fc7f4346ea0a0644a0ef3724
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=unkilled+mod+apk+unlimited+money+and+gold PDF link annotation
    • http://luisacortesearchitetto.it/userfiles/files/35984326723.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/72319619705.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wameterefigeg.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-14/20210914150038176507.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/dimapebovamowajavifepebi.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/xalonofifobija.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/famaxejejir.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/64258628694.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/laxileputepomo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/70858342526.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rixidaki.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109060800225159.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/9660038782.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/latomag.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/18151936611.pdfIn PDF document text
    • http://www.bash.cl/media/file/957013139.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/tirupububogesiraxamawav.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/tuwadobutiwe.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/91838365824.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210916174348.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/vofumeroxuwisigabujuza.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631221863.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_off0000b040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB040 15668 bytes
SHA-256: 98d9152e4a2de08b6000ecd31bb9e46157b195d1eea065d13d2161d60b8899d4
font_01_sfnt_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10780 bytes
SHA-256: 346292823aabb78a935700f9f25733ef784f71c2e5185284311feb3c2c9f81b5

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