Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f41590122ee5627…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 13:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ba06fe541c6f879a7b217bfca987a92 SHA-1: d1b55e52a3fb43a4e86d5263f3468b2f01e9926f SHA-256: 6f41590122ee56270cf6298817ca8c67bd9684a482adb0dbd8d8b4263cd7774a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URIs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=pokemon+crystal+download+for+android
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/27109688288.pdf
    • http://usairsprings.com/userfiles/file/64713675954.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/totamevaz.pdf
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/weruzenezemaviwuxum.pdf
    • http://hoteldanang.vn/uploads/images/files/tedebimojolarojikagotuj.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/xamumoxivexavijivepoxat.pdf
    • http://riviera.az/userfiles/file/bumal.pdf
    • https://mauspro.net/upload/files/51416338910.pdf
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/nudefupewojisolazaridifu.pdf
    • http://cnokorea.com/userfiles/file/66976670777.pdf
    • http://rabotatver.ru/userfiles/admin/56481086952.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/luwinakizugemejus.pdf
    • https://chp-travel.ir/data/file/nasotetagujipis.pdf
    • http://artediapharma.com/upload/files/83089502274.pdf
    • http://somsit.com/ckfinder/userfiles/files/15550583157.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/lewedexafetikep.pdf
    • http://bensonlandscape.com/editorData/file/funikunemudi.pdf
    • http://farmaciacogliate.it/userfiles/files/gulogupukudixovenunun.pdf
    • http://tcyy88.com/userfiles/file/2021090404303773499.pdf
    • http://koreanhotpot.com/uploads/files/munirosukupiziwig.pdf
    • https://chuyennhakienvangvn.net/upload/files/84087215189.pdf
    • http://yyfxsw.com/upload/files/muvufinazaxixizelage.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a9420da0---99077483957.pdf
    • https://olamare.com/img/uploaded/file/67558028796.pdf
    • http://kramnyca.info/img/upload/editor/file/xuladuwe.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cbc5ce1e---lemipelozivib.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_off0000b633.bin
bb7d4961f7381c30f78b46c422952909dc0a9a03583a9cc21ce590c234ce6bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 10928 bytes
font_01_sfnt_off0000cf9a.bin
050c6a9f21893d96c1de144515b422f0f267172eeb72603a8d59ab6213bfbaf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 15396 bytes
font_02_sfnt_off0000f6cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 16792 bytes

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