Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d321418e827db04…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 11:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac7c61b14b4aa908f90f5e8474db073c SHA-1: e49e1a4ae92cefefe8f87da54a043785e64e6681 SHA-256: 0d321418e827db0463f1f06e03183e01bb69d19c8abf9a14e146b78d8ef3e76c
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many pointing to unknown domains, suggesting it functions as a link farm or redirector to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vinniescustoms.com/userfiles/files/23898066884.pdf In PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/13805627821.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/wedojum.pdfIn PDF document text
    • http://appextskihjthj.handylover.com/upload/files/5514292443.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/1898913202.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/66338914394.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/wopanodusuravej.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/somaboxorasofixenopef.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/rolijepujuzara.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/72453457968.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/gazavokexipegosopilexaj.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fefupabiluzugajudaf.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/wakanofid.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/29979357959.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/pemuvovukudiwivinedor.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/49163945533.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/kijefi.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/dozazozujazilefodivalozas.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/dapolumozozetejemevakab.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/138779472.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3ed56abfc8648ab5c4871abfda46bf3b/49391804358.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-20/20210920015050682753.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/zasifimegigapore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=snaptube+video+downloaderPDF 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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10684 bytes
SHA-256: 74c37ca3cb7888483a26ed8ca6be2de6a615645ecdf24003d98e5e235636c4f7
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 17396 bytes
SHA-256: 2fb6c5a7488df870ecdb0952dcf34491e54b3455371a8629c5f367aaf2256044
font_02_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1