Malicious PDF — malware analysis report

Static analysis result for SHA-256 9755ebeb35c24f5e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 07:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfeca0684647a5fd6505c9b3cb2e038f SHA-1: cadb9854d757500426d4558ae629d09c3e1a2f3a SHA-256: 9755ebeb35c24f5eca751db3aa82d48a6ffcfd778436b07a8a55a95a456c1fc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to distribute further malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on low-reputation domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=pokemon+omega+ruby+download PDF link annotation
    • http://z-him.ru/userfiles/file/10312600694.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/lapiviwof.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/butiparenurowijolafosut.pdfIn PDF document text
    • http://snsi.jp/image/news_file/32963237500.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/kopip.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/65237633046.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/61086456690.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/wotexivoledi.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/13560800967.pdfIn PDF document text
    • https://cncunse.com/d/files/14890428314.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/85399550808.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021950735171.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/gotabawabigosixokagoxid.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/21451851834.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/pusuzubizoka.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/kexudokunogimowediko.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///sononutokogonete.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/17834440135.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd60b4ec0c---ritazikomo.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/18635368278.pdfIn PDF document text
    • http://unityproductions.com/upload/files/zevalatududenizo.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///389267426.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/45637240276.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/79979408216.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/41608777214.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/bidurukibomepinalegenoge.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10764 bytes
SHA-256: 61933b6d1297be4ec39c74570e9d150b75aa8610a2542176406983b6de5828ab
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 18292 bytes
SHA-256: ce4ce2244398f78429c649a2e3f41f65e4bcc05c605649a6b2f0940aeb3f4253

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