Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb0c13994a60595…

MALICIOUS

PDF

79.3 KB Created: 2021-10-05 18:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e657cb87b0700daa1e2b69dd53e945ca SHA-1: 58054cff5c95be69bd8cdab4ca8b99dc2ac28dd6 SHA-256: 6fb0c13994a60595d4d1943d2b6a0d4c04d4cfe66ea360330c5192518d559fb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. 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 point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=painful+blue+lump+under+skin PDF link annotation
    • https://izometal.net/mm/file/verumu.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/12531731237.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/radilejegiforudalur.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/napufewapijegulig.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/waxiz.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/buperizoxosutididiw.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/33580743008.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/pigor.pdfIn PDF document text
    • http://copperscrap.wasteequipment.net/ckfinder/userfiles/files/99526462120.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/xujujiwo.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/vukosewewasafeli.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/81883fed7df7802bff2c0e8f9be1eef1/8723783679.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/9096785027.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/detatepomexop.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/2078925024.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/gilobadutagiruxerepapif.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_22_16_02_58_8397.pdfIn PDF document text
    • https://attack.lt/images/files/tuwowufalezuli.pdfIn PDF document text
    • https://tepihtrava.rs/files/96811822567.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/gogumosolelugiwamiwewu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/besunewux.pdfIn PDF document text
    • http://ilkemymm.com/image/files/vijumovovidedatiwumage.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/57248498267.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/88468674827.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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 17288 bytes
SHA-256: fd7ff0380db4a9beb5eab1ab289d38eaaa2694c18ab1255063af4171def2c138
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 10772 bytes
SHA-256: 7529b50632ad1c2a2f5adaf1102a2a0af1710ac0e1689af88dd185f6be9c12f3
font_02_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1