Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b706201fbaf308…

MALICIOUS

PDF

415.8 KB Created: 2021-05-02 01:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a5192fed5bfe15f1414e48b57e9abe81 SHA-1: 4aa99c5ba92bc8bd325b845205d917973751332d SHA-256: f3b706201fbaf308df118bdac0687154378a6fa471f39bdcf585576383078095
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating the presence of external URIs and embedded URLs, with one prominent URL being https://mezovuduw.ru/strik. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9422

Heuristics 4

  • 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://mezovuduw.ru/strik?utm_term=what+is+statistical+machine+learning PDF link annotation
    • http://sollabs.xyz/49625138031pjff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_604ed3a84f874.pdfIn PDF document text
    • http://igcopyrightforhelps.com/melalowegajub5l8j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5fd7c03b1023d.pdfIn PDF document text
    • http://peludofnor.fun/capsaicin_patch_walgreensv8a9w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5feb18139fe78.pdfIn PDF document text
    • http://svoydvalend.xyz/top_100_games_of_the_decade_ignxrjzh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5fc940615ece0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456420/normal_6044775db5136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_6013bf993639b.pdfIn PDF document text
    • http://keepsufi.space/free_aswb_clinical_exam_study_guidejwiaz.pdfIn PDF document text
    • http://devgm.design/moxigesokitodutabilobolzo00g.pdfIn PDF document text
    • http://itfamily.pro/gerozanuwac29zo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_47d5ce606d684709a118120bb960c994.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_3efffe9f9e0e4107b8063a3c873ba508.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02e0ea5-b1a5-482e-b26c-32e762499aa7/programmable_logic_controllers_an_emphasis_on_design_and_application_kelvin_t._erickson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ce7ab4-3c6b-4235-bbb9-c902408f10dc/how_much_of_a_calorie_deficit_for_fat_loss.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_6fc97c8bdbf9484ca5b330ffb0086638.pdf?index=trueIn PDF document text
    • https://af4bb04d-41a2-413c-b691-ce0a46ff998d.filesusr.com/ugd/e677f8_6239dd5dfcf7440eb9e432ce646807e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2f9026-1e18-413b-8f84-2cc81cee6b2d/all_stargirl_characters_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dbaa1c4-b75e-45ec-b8ab-6e6e53b7a4ee/how_to_really_listen_to_your_partner.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000630f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630F9 5228 bytes
SHA-256: 35c1edee24376b0bd5bb989fa96ceae29bf3c0c35d497f32fbb577c6d61a5343
font_01_sfnt_off0006429f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6429F 14404 bytes
SHA-256: 6ac6c75edcb83e55a049b29b2927e503df434b18d385bdad9d6279ae692fcbb5

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