Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ddfd470c9c0b49…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 12:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abaa0f0332768212a05e1a99fd9f86e9 SHA-1: 300583036174db747bee46d564d9f2d4ed0c9b78 SHA-256: e9ddfd470c9c0b497696277a1ab441acd5c6cbefe47ee78ba2f6273341c51cbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://parzenica-bialka.pl/userfiles/files/67175940680.pdf
    • http://raffaelecavazzoni.com/userfiles/files/lodasopuwen.pdf
    • http://haohanlegend.com/Uploadfiles/files/nubuzusa.pdf
    • https://digireg.org/upload/95933448370.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/61429506148.pdf
    • http://castrolmintabolt.hu/images/upload/file/rekujasobosa.pdf
    • https://cnc-ar.ro/files/file/mivifukas.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/4691108777.pdf
    • http://geoodwierty.pl/files/file/62213349189.pdf
    • http://lexxyin.net/files/fckeditor/file/86669851352.pdf
    • https://ht-cooling-j3t.com/contents/files/52904536885.pdf
    • http://barrospizzadb.com/uploads/files/bekatuxukot.pdf
    • http://shipsupply.ru/userfiles/files/94767162953.pdf
    • http://ideal-site.ru/userfiles/file/kemunobesoku.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/mofenesejinirilas.pdf
    • http://polishingmarblefloor.it/userfiles/files/bunekawifawaxelilujawan.pdf
    • https://kozmetikadunakeszi.hu/userfiles/file/38784555879.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_03011807171D3B9B.pdf
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/90347203255.pdf
    • http://engroupe.ca/aym_image/files/bogus.pdf
    • http://sanyosushiglendora.com/uploads/files/98776532649.pdf
    • http://davcpundri.com/css/file/sipujomulipiregan.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/39412e4f6b4231ee2b8ee4425b6a4cbf/86027381322.pdf
    • http://veszpremkosar.hu/_user/file/tatepiroxaxujaroliz.pdf
    • https://zhansq.cn/upload/file/1042568749.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ghost+text+messages+android
    • 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_off0000c62c.bin
40d9145e743f3e04354810cf81c4cef063f91cae6c0ce55bc04e349cf716e658		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 17448 bytes
font_01_sfnt_off0000f2b1.bin
9ae75c45926f0b738e1e039c74546b72767fd3759382b5080560d5104e724b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10792 bytes
font_02_sfnt_off00010b3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 16792 bytes

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