Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ffe1e583b23f6e…

MALICIOUS

PDF

91.2 KB Created: 2021-03-17 16:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5a8e1750236c2413746ddc69ade2e0 SHA-1: d0f783a25160e458c35d5da87348b8d4cbc31d3c SHA-256: b9ffe1e583b23f6e11bf5f1b574cac72536548942b0471b63ee740edb506c615
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' that includes 30 external links. One prominent URL, 'https://jumiwimov.ru/award?keyword=epidemiologia+pdf+oms', suggests a phishing or content-luring attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jumiwimov.ru/award?keyword=epidemiologia+pdf+oms
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/2251314.pdf
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/d81f50ab93e.pdf
    • http://jorowijedo.mywebcommunity.org/tonin.pdf
    • http://tuxiwos.iblogger.org/what_is_carnal_knowledge_in_the_bible.pdf
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/6466209.pdf
    • https://varalege.weebly.com/uploads/1/3/0/7/130738576/5404495.pdf
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/viwejezud.pdf
    • http://guzexesuge.mypressonline.com/asus_q551ln-bbi706_notebook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vorisenunajix.myartsonline.com/side_by_side_book_2_activity_workbook_download.pdf
    • http://nomamazuzut.atwebpages.com/area_of_regular_polygons_worksheet_answers.pdf
    • https://s3.amazonaws.com/zonivezada/rujuwob.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_9bf2e66671db4606814dfa07f3a934b3.pdf?index=true
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_633d070a614d44eb88128ca1f34dcd1b.pdf?index=true
    • https://s3.amazonaws.com/dekogamik/viludivugexugojobuxenise.pdf
    • http://fiwimawa.rf.gd/radowefowesuniwajorapi.pdf
    • http://kalilom.epizy.com/9006653142.pdf
    • http://kejusekijo.epizy.com/angles_worksheet_for_grade_4.pdf
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_3b86c73cb72d4970b3ba1719b2e7629a.pdf?index=true
    • http://xifudovolamam.epizy.com/twitch_android_app_black_screen.pdf
    • http://duribolatajofa.atwebpages.com/mojonekuxuvubedokez.pdf
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_ee82519190cb46808819eabc2577b053.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_2c0639d5a5d64650b65cc52eb964e8de.pdf?index=true
    • https://s3.amazonaws.com/zugutixe/broomfield_soccer_club_uniforms.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_1a4b29bc58ab4e5882f9bfd34f928cac.pdf?index=true
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_3bfba48b9d124aba92e703177b3072dd.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_off000104b7.bin
b8ca315b4db4680ad369aa4876b14bc5ed3885257b548834ff1e6a1b3c327702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 5224 bytes
font_01_sfnt_off0001166e.bin
bd4b11d35200f7fb5c30976e12a04c6fc708e0f842b530077b5eaf93a90c560d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 2408 bytes
font_02_sfnt_off00012001.bin
3000718a209ad528b9424c7bcdf8403e69ba0c8cce101d17e96ba546a646d69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 12192 bytes
font_03_sfnt_off00014810.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14810 16204 bytes

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