Malicious PDF — malware analysis report

Static analysis result for SHA-256 950b71ea49a06922…

MALICIOUS

PDF

83.0 KB Created: 2021-04-20 03:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44d7cdf892bcb93aa821d9295f31b4f7 SHA-1: bb79335456c5779186038fc368b83cc1014ac62b SHA-256: 950b71ea49a06922747b9949152088c70ba0029c7580d371d5e7f03bfee0a947
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 are SEO-optimized and point to benign content, suggesting a link farm or SEO poisoning attempt. One prominent external URI, 'https://jottigo.ru/strik?utm_term=how+to+figure+out+half+life+of+an+element', is flagged as suspicious and likely leads to a phishing or malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to 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-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://jottigo.ru/strik?utm_term=how+to+figure+out+half+life+of+an+element
    • http://ribavid.medianewsonline.com/abrasive_blasting_procedure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6a5571b2-b669-4b04-95ac-9f9f19ad50f4/what_are_3_physical_or_chemical_properties_of_salt_water.pdf
    • https://uploads.strikinglycdn.com/files/789b6e37-c7b4-4626-8794-866874c118d5/somitobikunogitiga.pdf
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_dad4612923814b3f8f10dad53cdefc9d.pdf?index=true
    • https://s3.amazonaws.com/zebarufuridorur/nuwesiwopotufajanagalir.pdf
    • https://uploads.strikinglycdn.com/files/6ea85cac-094a-4867-825f-d81c9fd24b02/nozubunejasejavasebamijo.pdf
    • https://uploads.strikinglycdn.com/files/b296730f-4f96-4084-9e4b-8ecbd2328dac/tus_zonas_erroneas_resumen_capitulo_12.pdf
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_2712647ea5c14239a8ebcd56e44dc917.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7dea8d67-8b7b-42f3-b3eb-b749d4ffbe73/vobolexifebirepejifuno.pdf
    • https://uploads.strikinglycdn.com/files/0918fb97-0d95-4f6b-91b7-e85f6a1207b1/stealth_cam_trail_camera_reviews.pdf
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_78cb16c991ac42fda1815355bb7ee7d4.pdf?index=true
    • https://s3.amazonaws.com/juzewojavomofew/tivutawizagamerukonera.pdf
    • http://nufisat.epizy.com/xevomemisiluwixusomop.pdf
    • http://sajipesexadagon.epizy.com/ecological_pyramids_virtual_lab_activity_glencoe_answers.pdf
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_c9edfa0beeae4b0096e881b13d1ad46b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6dbd6cf2-00d5-44e3-a386-4644c0201c7a/zujivepojemera.pdf
    • https://uploads.strikinglycdn.com/files/abcb0db9-6c95-4c3d-a5a7-b486deb10115/pudevit.pdf
    • https://uploads.strikinglycdn.com/files/c7444242-3645-4606-b0ef-605ef7932600/kigijo.pdf
    • http://panexorumilogim.myartsonline.com/77588942649.pdf
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_1fe9807a50ce4ce58bfe57f61d3f3d5b.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_off0000f22c.bin
b7945564ea3ab368304d897ab50fcec8957acb5df2bfec70d584c9a0e3af8f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 5056 bytes
font_01_sfnt_off0001034b.bin
93a737461a3e9df4d52357e366fe06ffccf8f56c7c4ecd5b3ee1687851868766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10968 bytes
font_02_sfnt_off00012905.bin
2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 16096 bytes

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