Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a60e67535c360fe…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 00:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 232f95c157728615cacdc8fedde1b531 SHA-1: 7066b86aa30c990888f842aa974c8eae5555d4f0 SHA-256: 2a60e67535c360fe05c41af42f7cbd589865b3188edb1280a5fee4bedb2de93c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, likely a phishing or trojan delivery attempt. The embedded JavaScript is likely responsible for redirecting the user to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://proclima-membranes.ru/userfiles/file/89270254755.pdf
    • http://marleenjansen.nl/images/uploadfiles/46235303498.pdf
    • http://scuderia512.com/js/upload/files/zeketikap.pdf
    • http://mini-garden.ru/userfiles/file/4933912600.pdf
    • https://mimpiindahsatu.com/contents/files/popesebulijuruvabiwatawa.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/boxigudevariwofogeso.pdf
    • http://nandishoverseas.com/UserFiles/File/64400135993.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/07d5852927745b6c49e9ec5ceae5c0c8/posil.pdf
    • http://damosushipleasanthill.com/uploads/files/33627769345.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/45445847684.pdf
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_230807.pdf
    • http://resheto.ru/users_images/fck/file/wonufirulul.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/vixuda.pdf
    • http://guidesdugrandlarge.fr/images/import/file/81618103388.pdf
    • http://dinskayarealty.ru/media/file/93673859641.pdf
    • http://ziva-muzika.cz/files/file/juwatizijej.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614eedc6bf92d---xesobabutiwoduxijufi.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_11_18_17_49_6633.pdf
    • http://tcsm62.org/uploads/news/file/42902100004.pdf
    • http://cutskytools.com/d/files/91848531293.pdf
    • http://warwick-ems.org/userfiles/file/95997142542.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+design+home+house+renovation+mod+apk
    • 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_off0000abf9.bin
e0880376b73313e7e5111614bd44490e5ff060d1b4de1e2b819e3b3e1a248e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABF9 11184 bytes
font_01_sfnt_off0000c5cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 16792 bytes
font_02_sfnt_off0000ddde.bin
d5c14d4757b85445752d3a83005e7b91b9bf92d62af95ddcb3502a23b84518b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 14872 bytes

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