Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d5649f842c813d…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 12:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d94d42f4ee1b9204d25f188c34ec9410 SHA-1: 30930c5be8585628ddcf2868150724cfb5609ec3 SHA-256: e3d5649f842c813daca9a02b20df16fdb1d7b565398ec3bf2c745720f22d3cd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a link farm detection and a machine learning classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic indicate a deliberate attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=2+letter+words+beginning+with+k PDF link annotation
    • http://heldermusic.nl/ckfinder/userfiles/files/birojedidibiguwukoli.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/vozamigevodajaremafidifef.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210904_020321.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/72233433691.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/xedapagojubavuzolu.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/68113148660.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/16515299460.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/23658395341.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/16405172482.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/889fec8f8aed2cc0133205e6b4222962/fuzaxutegegenon.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kinurot.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/numixarefakasaze.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4723f01d924d6e9ef9cf5a9ccdc9ee3e/26641581336.pdfIn PDF document text
    • https://yifff.se/userfiles/file/supere.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20210925085805.pdfIn PDF document text
    • https://coevent.ru/upload/files/nadimefitulenevogegigu.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/52493727740.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/nijetorasowedikalo.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/84413870872.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/nevitinogogukibigedani.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/41560722440.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/33457838684.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_off0000ac4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 14648 bytes
SHA-256: 7c548a11917e79e4bbca6e35a71dbd68ca9bf3bc7efd1bd6f4641dc83beb948a
font_02_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 10704 bytes
SHA-256: 1ad454daaac930b4809a025dbc829eafe7c9b0fefc342a2313d5b6226e09d625

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