Malicious PDF — malware analysis report

Static analysis result for SHA-256 d733071f6508ee78…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 19:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdeff1d358a16332ad23b2b00f839676 SHA-1: 6e61ba6c16b48871bc380b02de40b920bb817773 SHA-256: d733071f6508ee78c3ef3eb7e514b6653f21fa9d78d9b388f960eb19396ded85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link farm attack pattern. While no scripts were explicitly extracted, the presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the sheer volume of external URIs strongly suggest the document's purpose is to redirect users to potentially harmful websites.

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://drafthe.ru/uplcv?utm_term=makalah+hukum+termodinamika+1+pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/47412543417.pdf
    • http://siciny.pl/userfiles/file/39244817872.pdf
    • http://ewtch.com/upload/files/kunuwatixuge.pdf
    • http://llux.vn/uploads/files/44740564946.pdf
    • https://marmetal.cevhertemizlik.com/userfiles/files/wekifejefoxalowuka.pdf
    • http://baby-daycare.com/uploads/files/202109081152299140.pdf
    • http://nesemlak.com/test/images/uploads/files/gewodulapozobogoxum.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/xakafegivilipowikij.pdf
    • http://ch-bovi.com/upload/files/rafosu.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///85507394620.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/wukonakop.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/36075002316.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/43377744801.pdf
    • https://mlspoland.co/files/file/zenixevebikofiwedepixubix.pdf
    • https://whereestar.com/marinarubicon/admin/file/megineretebisabevipiduv.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/rajumenofalatejavisas.pdf
    • http://iberryhomemade.com/userfiles/files/vadizisiwiwe.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/madutewubodabakurifitib.pdf
    • http://3e3i.com/UserFiles/file///welitufiwo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9fbaceda94fdf2049fb89b24d484d40b/gabab.pdf
    • https://floresdeserrezuela.com/aym_image/files/51371564504.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137addd2b847---zinuxosek.pdf
    • https://clubesolbra.com/uploads/files/42549058198.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c6.bin
54fa41ad6a1e6d834a01fcbcb1925d607507cfa7e4fa0ff09c6af770111e073b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 10832 bytes
font_01_sfnt_off0000ea8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 16792 bytes
font_02_sfnt_off000102a0.bin
fdeac71e87542327d7f4e9a372e0a1e4933ce564604f7b1eb359995c45821565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 19736 bytes

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