Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56806557ff7950b…

MALICIOUS

PDF

82.5 KB Created: 2021-03-21 11:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f81971d6c4c60c967c8b8821f820628 SHA-1: b48633faa9079da38459acdf6e2705182aa60bfc SHA-256: f56806557ff7950be0c7c528435940f9b78bb47e64d6c277246a6d61fed55ba3
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm designed to host multiple external PDF files, with one URL pointing to a phishing-related domain. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

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://seumenha.ru/award?keyword=shylock+agreement+form+pdf
    • https://cdn.sqhk.co/rajemaramiw/aif7Mje/dreamers_political_definition.pdf
    • https://cdn.sqhk.co/pegipoveridi/ifhjxie/marogabijir.pdf
    • https://cdn.sqhk.co/jebavimot/jXgcihf/futurama_worlds_of_tomorrow_dead.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_60405807a2e73.pdf
    • https://cdn-cms.f-static.net/uploads/4480584/normal_602840dc7a870.pdf
    • https://cdn-cms.f-static.net/uploads/4383692/normal_6043e1eec3fb1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pugotividat.epizy.com/asus_z97-p_bios_reset.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_8a792dfcc3b245f5b05555ebf2794774.pdf?index=true
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_e1fa45fbaaec479ca4844fe5f279f73b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37bf32f2-d5fa-4d5c-975f-891efc2fd3b5/19300238064.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_140d3dfcb7384383ba6010d7e8420075.pdf?index=true
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_5a1e39a56ff447b2a231322a392fa74d.pdf?index=true
    • http://gavemuvivagezed.epizy.com/ciclo_aerobico_y_anaerobico.pdf
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_f2893e4485564969915aecbbe4f525d5.pdf?index=true
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_b9388a81477d45929148ef3cfc8218f2.pdf?index=true
    • http://nexolep.rf.gd/auld_lang_syne_analysis.pdf
    • http://wobirazegezuw.epizy.com/96419305325.pdf
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_0b73c4fef3a5411084ca549da8ad46fe.pdf?index=true
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_64bb87afbbed4e709b4c01dfface9d08.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6623ff34-723e-4fd8-95f6-551f0dadf94f/how_do_you_reset_a_combi_boiler.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
    • 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_off0000ec76.bin
6d533e62043c408e9afe29d66e9e09da02baaa2718df4e196f56e3965ab27794		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5660 bytes
font_01_sfnt_off0000ff9d.bin
db20d100be8743930a48ad0f6010920d9f9753c205f571e3224c2c5832003d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 11116 bytes
font_02_sfnt_off000125b3.bin
1264a556fabc14c69ec4ba4609a347bffa09942e523f09f2774283a283413be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16088 bytes

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