Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50d499905d9f3ac…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 07:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f3ced74b0293b16f4f2a39025c49ac5 SHA-1: 793bbc2cd99864501bf53d5a374cad31a25b7dc3 SHA-256: d50d499905d9f3ac2f26983dd52d6d64759420acb3367c7ab5796e3f7dd5b4d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting a lure to external resources. The PDF structure and embedded links are characteristic of phishing campaigns aiming to redirect users to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=dark+avenger+android PDF link annotation
    • http://ahxxzx.com/userfiles/202109/file/dewugux.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/vumama.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/63474478530.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e68850d68---niwodinapurudorajofadoje.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/34860404406.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/11598868571.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/93850920734.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/35206139883.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/58412504405.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/karipujin.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142be072a772---62722510096.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/76960720082.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/dezamufononedavatevaju.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/fokirana.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/naredosajajizabujidaf.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dexujonola.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/34262301140.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/80257431790.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/8239132883.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/tukeposuzizarotadi.pdfIn PDF document text
    • http://cbstav.cz/file/dokefiz.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/88739696825.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/14183675058.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_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 10268 bytes
SHA-256: d00a4a23706ae39c5468231c42472c88a2c8809f5646713a2db19f494236de01
font_02_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 21208 bytes
SHA-256: c209cdae66eac821e07b5f589287628ba1cd77ce65fc1d3380d9e37fa0d78f53

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