Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9ed5b54002d9a8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 10:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eae1c432201e2e2a4ef31537d7b05ee0 SHA-1: 5cdb25ff4a051d649daaab31b5ce30cf99ff517e SHA-256: ed9ed5b54002d9a828fbcac6502ae5043804baca8e51866bdf4850be49417ece
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://infrive.ru/uplcv?utm_term=nutrition+tracker+app+android PDF link annotation
    • http://krukewittfarms.com/userfiles/file/wulutiregi.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/6288377572.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/nodig.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/94657473755.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/tegunujediwegixivopefim.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/fabajulo.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dujekanuzuj.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/latovuvejeda.pdfIn PDF document text
    • http://vaynhe.com/upload/files/3324511597.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/25354719260.pdfIn PDF document text
    • https://ismart99.net/upload/files/bajava.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/gamigekirisoputu.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/10504853361.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/gawudow.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/428906780d40bf2187ee00090e02fb6a/gizujowuvo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142035276c89---48823690911.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210911113434.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/383655382.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/79501089174.pdfIn PDF document text
    • 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_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10460 bytes
SHA-256: 1f3131c7a11d1c91422544f1ad9a12f37fd8a26919fb142767f243aa7372ab6c
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 17168 bytes
SHA-256: 7e1dceae831f8c761be934fca2b6075303ae7abd26aeb06adb466d5ef3ae9c8b

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