Malicious PDF — malware analysis report

Static analysis result for SHA-256 2674e42f8e051fc9…

MALICIOUS

PDF

75.6 KB Created: 2021-05-01 15:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db3d0841cb41a24ad7b3fd58dc75b0dc SHA-1: 4b13f7ec3e6ba1276a3a1ed8f5f0301ed10cd358 SHA-256: 2674e42f8e051fc907f2ec089fb3786361bc1522260a2182cad95ed6b90af586
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. One of the external URIs, 'https://ponafet.ru/strik?utm_term=stihl+lawn+mower+home+depot', suggests a lure related to product searches. The ML classifier and ClamAV strongly indicate malicious intent, likely for phishing or malware distribution.

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://ponafet.ru/strik?utm_term=stihl+lawn+mower+home+depot
    • http://xufamorazogubov.sportsontheweb.net/tf2_and_another_thing_youre_ugly.pdf
    • http://kupimaxi.sportsontheweb.net/wingstop_menu_mexico.pdf
    • http://nuraner.iblogger.org/nokutunowefivotekufe.pdf
    • https://cdn.sqhk.co/zetanitanedo/S4idUaD/lebarumakidunepib.pdf
    • https://cdn.sqhk.co/kinanekoxo/FjaheYV/freebies_by_mail_2020_no_survey.pdf
    • http://netolenogafa.getenjoyment.net/beautiful_liar_zara_cox_espaol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://biwodonugawodil.rf.gd/minority_report_full_movie.pdf
    • https://uploads.strikinglycdn.com/files/82acd361-3395-4683-8c5d-b0a6cbaac4e7/12490376198.pdf
    • https://uploads.strikinglycdn.com/files/0d160d87-0dde-4cd7-b54f-d0337da61743/how_to_be_an_icu_nurse_in_australia.pdf
    • https://uploads.strikinglycdn.com/files/f1d3c9c0-a436-4c20-b2f6-1c92847bf60b/57344653323.pdf
    • https://uploads.strikinglycdn.com/files/a0b98203-af0e-4fd4-830e-97a5cd3efe5e/what_does_an_internal_communications_manager_do.pdf
    • http://lijowavatajo.myartsonline.com/how_to_fix_key_that_popped_off_laptop_keyboard.pdf
    • https://uploads.strikinglycdn.com/files/f8e1aab5-4592-4764-9655-d7629b8cf7db/kezexazivawesibov.pdf
    • http://ralununajopupe.epizy.com/gafojidinumigumorina.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_1f56658c97e6462a87030f97d1563022.pdf?index=true
    • http://karajifaderiwow.epizy.com/job_application_format_for_teacher_post.pdf
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_8c1aaab773dc4a079912aae0cbbd4688.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab270274-f3e7-4063-9636-47fae02065c1/how_to_fix_boot_from_command_prompt_windows_10.pdf
    • http://jejivosijej.rf.gd/ajax_tutorial_w3schools.pdf
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_a424a98130924d718f81d5cad78d8faa.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_off0000ea2d.bin
3545c774b4817884636fe7f118235f8cc6a5bad3244801aae587f6d90b97bdcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 5216 bytes
font_01_sfnt_off0000fbd3.bin
9f65f1a25e4b295207f5035c960e193a6f5554f534117d7f6f39a54c918ab543		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 11008 bytes

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