Malicious PDF — malware analysis report

Static analysis result for SHA-256 09917f6a5a399c82…

MALICIOUS

PDF

78.1 KB Created: 2021-09-09 09:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24ea9af56db70f2d78429af1285a7f22 SHA-1: 1f7d870d649626c3ffe2d50cdf6a30b3878938a1 SHA-256: 09917f6a5a399c823d60a02207c79dd1e1953b10513ed4947f1bcf59a77992f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URLs, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://stepasidemedical.com/images/uploads/file/72346098368.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161344f10eb965---69919942395.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/70022163359.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/fadojiverigegipazov.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/92769856488.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/midudir.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/naxagejugubikokikizewip.pdfIn PDF document text
    • http://js-space.de/userfiles/file/dujutugezulub.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bugowebed.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/6396564669.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/48810000222.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tunaxoz.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/zuvol.pdfIn PDF document text
    • https://penal-garazh.ru/files/tikevewageto.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/69745809470.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613510288d201---29995991927.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/10329564880.pdfIn PDF document text
    • http://prestopc.it/upload/file/falamalomukagosi.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/84595898983.pdfIn PDF document text
    • https://wonkingchina.com/d/files/ligujavik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=online+free+movies123PDF 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_off0000cfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAE 17144 bytes
SHA-256: 8c15a604c0de5e531ba18eeda370cba18d4475243306c06b117114d0253b924f
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10552 bytes
SHA-256: 81cb1919a4b40255fffa500ff6a5d985a6fc0e4a13b27a13d0f8725b15324bc3
font_02_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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