Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21d8ab66b25b961…

MALICIOUS

PDF

90.5 KB Created: 2021-03-13 15:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7f43b1e51f13e5f28caa69bb2fdcf2 SHA-1: 72c54fe94e0e7392ee6124eeb36e155994359c9a SHA-256: d21d8ab66b25b961d3e57fafdffa74f70abb05b399df4c58a6063103ffed57ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=tchaikovsky+symphony+6+pdf
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fc9b6634f856.pdf
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/luzaw.pdf
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/vofasuwunonim.pdf
    • https://cdn-cms.f-static.net/uploads/4383794/normal_6045be60324b8.pdf
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fdd83dd3004c.pdf
    • https://vizodejow.weebly.com/uploads/1/3/4/3/134356937/xesomikovaka.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_60243df550fa0.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_603eb53a0cb8c.pdf
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/4396195.pdf
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/mepasuriguz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_33219efb00bf4f3da5e0d028a9d50650.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_62bf31e8902d4c058805edc1b4734991.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_8b8e59d1496a42679d19672ecec6ca58.pdf?index=true
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_f2f0dd950c6f404aa406c2b38dc7fdb5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ba7e995-74fa-4e58-a78c-573f7348189a/seamless_bible_study_ebook.pdf
    • https://uploads.strikinglycdn.com/files/8369c3c8-7b0e-4c90-a0c2-e124130aad73/python_for_kids_free.pdf
    • https://uploads.strikinglycdn.com/files/3b9f5b88-dcd1-42c8-8529-367ff7d2a003/vuravivebinowamunafib.pdf
    • https://uploads.strikinglycdn.com/files/d985e2d6-7523-4ae5-b0ea-d41a83374624/88928361854.pdf
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b1a1054cf05349bf962f5adee50c37f9.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_5ce65e5a065042c4ba2a878fe5260377.pdf?index=true
    • 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://scripts.sil.org/OFL
    • 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_off00010a5a.bin
02360ad3de6382b3c88d1d53d8e1fd5a40af2c31b3bb9cf31ffcf16d9f7ba477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 5596 bytes
font_01_sfnt_off00011d4f.bin
2679099b44ca1796388bc39217ae3c7087a4e742eb77b067db8f738dd3e207a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 13324 bytes
font_02_sfnt_off0001477d.bin
184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1477D 16120 bytes

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