Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f2c8c2308c2f93…

MALICIOUS

PDF

90.4 KB Created: 2021-04-04 11:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8eef03a08bec95dbc87f2bbf2bf17b4 SHA-1: 424607147d81475946877e66c42b073fb732ce18 SHA-256: 16f2c8c2308c2f93e00cf7709db958b66857d550fc2e802c216414a56e7c8a8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. The embedded URLs likely serve as a distribution mechanism for phishing or malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=robin+hood+escape+part+2
    • https://cdn-cms.f-static.net/uploads/4491148/normal_604d0c71d1d9f.pdf
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/1574042.pdf
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/vopetilisubab.pdf
    • http://dotasif.iblogger.org/interior_design_magazine_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5fe320f571f26.pdf
    • https://femawigir.weebly.com/uploads/1/3/4/6/134661536/07b8e00b78b2f8c.pdf
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/guduxarawuz.pdf
    • https://xefimobabizigur.weebly.com/uploads/1/3/1/6/131637686/bezegevubogudes.pdf
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/09d0abc6f9f148.pdf
    • https://bemawupi.weebly.com/uploads/1/3/0/7/130740003/funajaf.pdf
    • https://miwefotuwid.weebly.com/uploads/1/3/0/9/130969826/56bca16e726.pdf
    • https://xalesuben.weebly.com/uploads/1/3/4/3/134368019/ninaw_kifakim_valejunisoroxu_kisusazenotisiv.pdf
    • https://cdn-cms.f-static.net/uploads/4500668/normal_606491e96b59e.pdf
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe4a1095e75a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_c9ed6029b7844c71a22a89a1885a2929.pdf?index=true
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_82769ca33b874126959ea55599d40689.pdf?index=true
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_78547c28e51140f8a2f6f4cefb180567.pdf?index=true
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_4664e9c94ca14c118d9e48e6558f9ec3.pdf?index=true
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_4c4e79a6e5ea4b07b849b49dd1d89164.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001230a.bin
122aa6a2390e60d3182462517c99bd721eeddf639d2d50019fed3837808cb0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 5408 bytes
font_01_sfnt_off00013563.bin
7cfc75c8e602da3367b724a586914e4c5566b0de7793a70160c39a753790a74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 11780 bytes

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