Malicious PDF — malware analysis report

Static analysis result for SHA-256 a722f8deccb36bc3…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3358b1f40e81cdae1cffccfaba770d43 SHA-1: e58b9fd4d6c048ace3aab19ff2db1b1ef67fed94 SHA-256: a722f8deccb36bc3bf5cbbd7c22cdd178ee10a3f7572b427e34c8a5936f251c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features numerous external URIs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://akcjonariusz.com/UserFiles/file/xesivekexuxilulefu.pdf In PDF document text
    • https://holcom-wd.com/webroot/img/files/lapujipidarabi.pdfIn PDF document text
    • http://stonebreaker.at/25260782700.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/liviwavejukesor.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fatiwifetulunoxurer.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/38963862276.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/42125372059.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f37ee283fe68d28b8e7dce9560f05e84/15784579513.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/gisojonoti.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/10123294442.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/42462091831.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/9452885078.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fulavokizijonomenekufufu.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210916223521.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/terikegus.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091602501073499.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/gelidukisisopor.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/3058949240.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109140251178235.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b72ee6e207---mirizarog.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/sebefamugivedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=film+app+firestickPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 10484 bytes
SHA-256: 206e27969f8387c01359c79ac736db18f448341781a8e42822246b2da66cb5ce
font_01_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 17872 bytes
SHA-256: d93fb385e623e22281b373f8e1503a5c344daf150b67dce643cb5de2014f7266

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