Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce99177c1d887dea…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 02:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b493762a475625f7c2306399c5a3de56 SHA-1: 35296e35ea082f6fd0ddeb61c354aab4f527cbbb SHA-256: ce99177c1d887dea16bdf317b93ed7ea3c3b2d64cd873493a71265f1e11a3439
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ClamAV detection as Pdf.Phishing.Trojan strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the structure and heuristics point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering via linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.moyekolodin.com/files/72579796483.pdf In PDF document text
    • https://knoxvilleremembers.com/media/supojijivubed.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210916150006.pdfIn PDF document text
    • http://gewald.ru/content/Files/xamuv.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/35094088039.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jojebokozurosobavo.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/zeluzava.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zolominekosoxo.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/vofonuva.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/9336051827.pdfIn PDF document text
    • http://cabini.it/userfiles/files/pibimizi.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/98332690429.pdfIn PDF document text
    • http://partnercable.com/files/15559896218.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/32606100752.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/90101116468.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/76848784854.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/kuwuluxemawenumexinur.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nomududana.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/rafasega.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/5285268913.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/79087397309.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/todixitokasojatina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=recuva+android+internal+storagePDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 17908 bytes
SHA-256: 26907c9ab1801029acc1d189064b1fa1f847f43547ba65ba48a877b87e1b13c6
font_02_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 10756 bytes
SHA-256: d7a2466e1b5583fd756414607179136e590a621e8aa8d6ee4ef18e02e69ee70e

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