Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e14325d62a6243…

MALICIOUS

PDF

69.6 KB Created: 2021-09-09 03:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ecb803495dbd6d42fd1980d512c0d44 SHA-1: 9ad0a0df68f418dd77e42f7f8de0c97d80528ab6 SHA-256: f8e14325d62a6243b39cfdcbac9d153db565cc3016f126203df640787588048d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ozdesignhouse.com/app/webroot/uploads/files/zozedotuwilodakiveteg.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/mibomimize.pdf
    • http://studiomarazzi.eu/userfiles/files/welejedujafegupufuwaforoz.pdf
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/kagav.pdf
    • http://qiuyutv.com/userfiles/files/20210906045749.pdf
    • http://cobmedia.hu/include/lazilepikok.pdf
    • http://asr-net.ru/uploads/files/soran.pdf
    • https://narellesastro.com/userfiles/files/91432958774.pdf
    • https://unitytradefze.com/ckfinder/userfiles/files/1714054788.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1159885852613896dd33355.pdf
    • http://biomedia.asia/upload/ckimage/files/10570285329.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/rebokilepimakuv.pdf
    • http://fixafilm.se/userfiles/file/nadiwunafarawukifeferixub.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/lqu6u05f2shq9ert78dmn7am96/bodowobumiwevos.pdf
    • http://iphysiology.ru/upload/89284420714.pdf
    • http://advocaatindex.nl/images/uploads/motajutabadade.pdf
    • https://njshore.drinkpoint.com/uploads/files/32671749520.pdf
    • https://habrit.tw/ckfinder/userfiles/files/43857903404.pdf
    • https://oklogistic.lv/upload/file/wogojumon.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50e5d048---82573068807.pdf
    • http://kompassztuki.pl/Image/files/72936216359.pdf
    • https://nomaquito-travel.com/editor-images/86294490710.pdf
    • http://holland-ex.com/images/blog/file/wosagapuwomijobu.pdf
    • https://yodobashi-church.com/delividuwugazobularija.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=playstation+3+gta+v+cheats
    • 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_off0000affd.bin
c326f8abd6e9ebaf5c4a1b9306b35fdd40d220cf4027d4a40c06ff7d2a8a7e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFD 15436 bytes
font_01_sfnt_off0000d663.bin
5766243ce33826c2438403dc65fba5b2b3fa4944b566ba4e983d3dbddbc5b348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 10760 bytes
font_02_sfnt_off0000ef37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes

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