Malicious PDF — malware analysis report

Static analysis result for SHA-256 25658330e84453d5…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 16:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f1291f44768d27d7fdd52e5a721a3db SHA-1: 537ea0ee94786a71a0171b98dd3726707f0541b3 SHA-256: 25658330e84453d5a8e87d3df5d887519034f071a24d7a7eb0c049b6e718e8d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or redirection strategy. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest an attempt to manipulate search results or distribute malicious content through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=flyer+template+psd+business
    • https://cdn-cms.f-static.net/uploads/4403270/normal_6031c1cd67a1f.pdf
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5fe0cd945222d.pdf
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6013c0df5f6a6.pdf
    • https://cdn-cms.f-static.net/uploads/4487194/normal_600ba22114d5a.pdf
    • https://static.s123-cdn-static.com/uploads/4485569/normal_5ffef9dd5c0fb.pdf
    • https://static.s123-cdn-static.com/uploads/4371790/normal_600495d54d18c.pdf
    • https://cdn-cms.f-static.net/uploads/4415769/normal_603fb92cf31d6.pdf
    • https://static.s123-cdn-static.com/uploads/4447437/normal_5fcbab8d836a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_e4e8cdbe863a43edb979c6d103961d31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/261df57c-3350-4e80-99b1-ab50e7c190cf/riwovilodudofopixajivulep.pdf
    • https://uploads.strikinglycdn.com/files/25f81df0-d997-445d-b5a0-19cf77ec985f/ferrari_f40_engine_bay.pdf
    • https://uploads.strikinglycdn.com/files/5bc500df-1e4c-4056-8352-ff5baf6a751f/silabilowofuvon.pdf
    • https://uploads.strikinglycdn.com/files/1b5c289a-a955-4b8f-bdbd-64f29b19e4f7/letra_de_quiero_un_mundo_de_caramelo.pdf
    • http://nufuwulevek.epizy.com/29552053549.pdf
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_44a2fe351008485ca4a16479f506e7f4.pdf?index=true
    • http://vuxubeso.rf.gd/37361521000.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_00a6070068a740bd98d86cd8fb38fa34.pdf?index=true
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_852b53f6ea7a454f9f75987fa4298471.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7f8b1ea-a7a4-4e11-be6d-340267564bed/jonalobavaruwukara.pdf
    • https://uploads.strikinglycdn.com/files/c455b95e-6669-43f3-be2f-66e781d8bc27/bubemu.pdf
    • http://rugeminawa.epizy.com/tidopigupubipike.pdf
    • https://uploads.strikinglycdn.com/files/9d975b3e-1efe-4e07-9863-916f1acc5512/film_genre_moonlight_crossword.pdf
    • https://uploads.strikinglycdn.com/files/db1d26c9-4a28-48d5-b32d-57407ced7aaa/correcting_run_on_sentences_worksheets_with_answers.pdf
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_2fe0856927d94b6fa4112db9b4edda42.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be728d25-402d-4d9b-b229-717d4b45f558/how_long_to_leave_tempa_dot_under_tongue.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41c.bin
d3b5d8c30b4029544c29a8c13d9824563189a6c1ee046a2ffece9f1577edafe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 5300 bytes
font_01_sfnt_off0001060a.bin
ca0829b020b4009217c578c8be055ed7421e30ec45912db4caa54fddd168454b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 10732 bytes

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