Malicious PDF — malware analysis report

Static analysis result for SHA-256 6319134ee04a2e00…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 00:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4d25c8779219a6c928dc01540d01f5e SHA-1: 81706be7628fb83729944e0df494f6f1af85449b SHA-256: 6319134ee04a2e0098926a85d6b4a93300753206f126ea28f6f6faea7a4380f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://liderzy.natura2000.pl/imgturysta/files/50318221494.pdf In PDF document text
    • http://veszpremlizards.hu/_user/file/32597326268.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/memuzovumofuzelopivaxu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/35894045131.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/24395630883.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/sokaxusov.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/80705512172.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/75776003704.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/gazakaxefumulunisariwam.pdfIn PDF document text
    • http://holzbau-napetschnig.at/moxitosirinogabowit.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/47689100388.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191083582505.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/povip.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372cb0c9d6f---nexafejunofubajewobotaw.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/lifewulirewasasojo.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/lupilawisux.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/9339201831.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/rutupaxilaxokaru.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/66294539379.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/93166918697.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/30502172314.pdfIn PDF document text
    • http://tai-group.com/upload/files/musobivoxesaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convert+pdf+with+password+to+pdf+without+passwordPDF 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_off0000bf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF11 18712 bytes
SHA-256: d1339c4172c536d4c0aa93e90799a93da452817a93d00b1cf331de4770ed7a30
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 10832 bytes
SHA-256: ef9452b5c8909d9dded3954a224d748d5722c555eb6be0e8f1177536faea45a9

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