Malicious PDF — malware analysis report

Static analysis result for SHA-256 302d64892f57c8d3…

MALICIOUS

PDF

132.7 KB Created: 2021-04-07 08:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bf66468ee844dee80d35d6450cbaf40 SHA-1: 19abc739698f80be703292a22acc1c3b7506446a SHA-256: 302d64892f57c8d363eca61590e19706ad3e18536e86cb4620621a203a88a1f9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to direct users to phishing sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/wix?keyword=asco+gu+2020+abstract+deadline
    • http://bejavivamiji.22web.org/how_to_replace_cooker_hood_lamp_holder.pdf
    • http://laulu-go.ru/rarugusimajuvezixozvhvq.pdf
    • http://vehicleinsusa.com/lepevuwilepogorepowojeragwgrmu.pdf
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/3a1b3f5285e0818.pdf
    • http://mrshadow.net/action_verbs_vocabulary_matching_worksheet_107ajp.pdf
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/ccac7377ed.pdf
    • https://debozolajaxagaf.weebly.com/uploads/1/3/1/0/131070846/552e7f12ff.pdf
    • http://sendgrid-de.com/apple_app_to_convert_to_word8v8dk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_06df81ed8bce48aabadd7ae1ccf12e36.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_0e5b456f35af4dc7af8b11c8c9fe218b.pdf?index=true
    • https://s3.amazonaws.com/fasudikek/tor_browser_2019_android.pdf
    • https://s3.amazonaws.com/xomepixo/psat_practice_test_1_answers_2015.pdf
    • https://s3.amazonaws.com/jevedijadiki/19712039910.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/floor_plan_layout_design_software_free.pdf
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_89dde37c50a54b4cbb47ccde94d3452b.pdf?index=true
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_946416a1ee3249dcb80260b2099d961d.pdf?index=true
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_cd47c20b66c54dd9ac335ff0182fc503.pdf?index=true
    • http://dofoxevepijuzox.epizy.com/pikoguja.pdf
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_c8922e0b8ac24ce3ac6e0ff6f5651900.pdf?index=true
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_71692f14d0fb46d0a3211e42abab925a.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85e.bin
cb89383040a54f6a9f19d2dbfbf3104cd766472afbf4593b465818c0e90a47e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 62728 bytes
font_01_sfnt_off0001b4cf.bin
4899f5d5fc68fb989184fe3e47c9e113b7593b8a8260e6cd3a3053ac1ecd8206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4CF 5512 bytes
font_02_sfnt_off0001c793.bin
f3ef5bfe02c69782ff9ceb4d7b001c2cddd521213bcd8732240648d14c24a68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C793 11212 bytes
font_03_sfnt_off0001edf9.bin
89247d3646e3773572243f1d4b0449240b5d7bcbc9865045ac28c7845acd9c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDF9 16068 bytes

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