Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe8c7c07754e1ff…

MALICIOUS

PDF

83.9 KB Created: 2021-04-06 06:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f83112c0cdd9361420ba8f62b1f380ae SHA-1: 9a91315fea16d35cfb228189a76ea601fe437cc7 SHA-256: 6fe8c7c07754e1ff2dc11087b4edc8d10085722bf8212f99843b97609812bf3d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high malicious score. It contains a large number of external links, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=age+of+exploration+worksheet+quizlet
    • https://kupubasurunasoz.weebly.com/uploads/1/3/4/6/134695217/waruvizifiju.pdf
    • http://fusafanomogade.iblogger.org/vogerivewesikuzir.pdf
    • http://vehicleinsusa.com/choices_game_hack_androidxmbm7.pdf
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/2e2e4620.pdf
    • http://kavevisukedawox.22web.org/budget_2020_upsc.pdf
    • https://zivodigogugev.weebly.com/uploads/1/3/4/6/134664532/160626.pdf
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/e16f2774f213.pdf
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/4471849.pdf
    • http://circulyarkadigital.xyz/20923386277vi585.pdf
    • https://dopizuledukure.weebly.com/uploads/1/3/2/3/132302960/343698.pdf
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/gegilipobub.pdf
    • http://aycotoro6.xyz/what_does_the_digital_divide_mean_for_the_worldcgwcd.pdf
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/8391666.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jujewejono.epizy.com/41525192465.pdf
    • http://pojoresoma.rf.gd/49555593231.pdf
    • http://wajodojizofe.epizy.com/62853861024.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_f8a16116739643c8b845170bf443945c.pdf?index=true
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_6e1c58358d8e40b8a74a0bc7ef6b6d68.pdf?index=true
    • http://tobesonev.rf.gd/79152695033.pdf
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_d48ac12f05284d2f9755342e344de279.pdf?index=true
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_8e2c4ad3470f4e3ca16c8615c4dddc37.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
    • 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_off0000f313.bin
6a5fad5c673a27e7a150cdb8b39643ab95673e612f84d2b9d854e0b4d5b3b4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 5552 bytes
font_01_sfnt_off00010625.bin
6dc5026cb2f84beb29e7915abad19fd0e164aff0bab3ec936aedbd72e3fb5dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 11196 bytes
font_02_sfnt_off00012c72.bin
a85b18bcef6ed974489a2ea11e0a151cdd6caf31c82356addc7bb89ef49f19e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 16236 bytes

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