Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d9f2a87436e085…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 04:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6f02a29f79b398bf0ee987642b1e5fa SHA-1: f16445a05a2aa7a6ea470c2437d94c024f9394f3 SHA-256: 54d9f2a87436e0859a0a7dbe8d7d0f8da47e542587b77eacf8a865cd6364ce58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=malayalam+news+tv+live+streaming+free PDF link annotation
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/86321250003.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/milexevaxodanazotu.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/56369556597.pdfIn PDF document text
    • https://techlan.pl/files/file/kakigekufanodureselikono.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/96819520478.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/wosikufotujunuj.pdfIn PDF document text
    • https://podimercrm.com/img/files/topivagigifilagerodipiku.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3df6d90dc---69141388709.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/59812378878.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/kenubozenu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/30871924993.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/xupaserimiwofafim.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/ranokedezipavipita.pdfIn PDF document text
    • https://kimcert.net/E/file/teravawobobumimiraj.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/zizuloxujozepi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/25937673255.pdfIn PDF document text
    • http://acelybio.com/upload/files/rapasusasona.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/zalidofokegixapexob.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kuputomasiwaximulomupofir.pdfIn PDF document text
    • http://falerisztika.hu/tmp/91222267639.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/89662148542.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/78101203391.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/84725246692.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630548942.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614451b690e49---pitusamizevejirebep.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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 17768 bytes
SHA-256: 9f78ae3cf09d4daf92aef33419d292ade2124287af752718d1c42184a4f3e908
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 10696 bytes
SHA-256: 7f53e2c8cf309ecdc19e3d2e0f51ba933f18f548bb42cf422fb93948b29998ce
font_02_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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