Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7efc86cf5d21ccc…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 16:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 329a6eebbea14cb68ba5423c22d66fdf SHA-1: 362acdc3d3531a5aa9b6690256fa9ead8ba7056b SHA-256: f7efc86cf5d21ccc430d22d5b9307cbe808e8ca0c6075278e2df08395ecc546d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm and a phishing/malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL distribution suggest the PDF's primary function is to redirect users to potentially harmful external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.nachtruhe.info/up/files/feninidesimadov.pdf In PDF document text
    • http://kaies.net/upfiles/file/fuxexototomi.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/3232202729.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/73183425429.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/runatanotodosonaje.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/vivilusuwosusixobak.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/sumewag.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/24160811689.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/xatomenefumi.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wafapeno.pdfIn PDF document text
    • http://thuannam.com/image/files/21680906907.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416016b45f1---76425763881.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/89511530173.pdfIn PDF document text
    • http://ipublicity.cz/data/file/36928208488.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/97252419727.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/68882500094.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/56236344522.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/2102442592.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/26541131956.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/98792324848.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/relageluz.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/zezigolimositaxakevodo.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/75011785451.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/vulabojato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shapes+concept+for+kindergartenPDF 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_off0000b30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 11020 bytes
SHA-256: b36c4122a589dfd8920375d3ba09b983c9d87524bafeef2d977420e8ba193313
font_02_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 16616 bytes
SHA-256: 661cc74c8de22a854dec63b4240b93c417c330b67250dc3db05378efd24ee51a

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