Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a7f7fc41d73a1d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 07:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5c958996317a012021617a4439da5e4 SHA-1: a760d670a4058ca1537610ab4b497bde4fc44253 SHA-256: b5a7f7fc41d73a1d68c5e7cf5039e1e85e8b23597419484db1a81d544974c328
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crmrealty360degree.in/userfiles/file/goduk.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/kunasodepopenidukeme.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b8ah69pjo100nve3nc36nuhl1i/feliwutemibilamufe.pdf
    • https://thefencedocumentary.com/adminfiles/file/94738645114.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/golepevozeboxis.pdf
    • http://hyunsin.net/userfiles/file/susepidetilin.pdf
    • https://rumputhijau.com/contents/files/juxidenolofekido.pdf
    • http://ajtoablakcentrum.com/_user/file/saluvafedejuwuvimowo.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/30754925302.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b08590cdd---zatulawipizorogu.pdf
    • http://anhbanglaw.com/userfiles/file/93629697550.pdf
    • https://dampinggame.com/calisma2/files/uploads/9296846251.pdf
    • http://commune-bourre.com/userfiles/file/navovufawax.pdf
    • https://nexapos.com/upload/files/47903763624.pdf
    • http://cautrucpalang.vn/webroot/img/files/39186400112.pdf
    • http://malovanesklomh.cz/images/file/vipisesekadutuxod.pdf
    • http://uco-kampen.com/media/files/murukexudeboz.pdf
    • http://446888.top/userfiles/file/51812994393.pdf
    • http://showplus.ae/userfiles/files/rogerit.pdf
    • http://ysenb.kr/board/file/editor/file/27352101272.pdf
    • http://studiotecnicodama.it/userfiles/files/88833158184.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=la+historia+de+gazapo+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 16792 bytes
font_01_sfnt_off0000ebc7.bin
0e0a710a6e90fd9b18bfeb0e190923cd67c3dc183cd19b6b03d61171537c96aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 10644 bytes
font_02_sfnt_off0001041d.bin
9a33a2d3da2004cfd8ee1549647c3e9a4cd57fdad24088d937446c521c505a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 20004 bytes

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