Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c57e349ffa60a3…

MALICIOUS

PDF

75.7 KB Created: 2021-04-03 20:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63337a7cda2dacabeee861cbe9d3acf SHA-1: 9e137ab2e7cb4df2aad7ab7c4d03ab6e72ee285a SHA-256: e8c57e349ffa60a3a3c9e505b5bb254d65c8e23ca607629069dfd7622da65d7d
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a URL that appears to be part of a phishing or malware distribution scheme, disguised as a study guide. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://xezojetit.ru/wix?keyword=mcat+study+guide+pdf
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/rekef.pdf
    • https://cdn.sqhk.co/fabokofe/Igjiejg/megudiwepisewoxo.pdf
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/wupalosevidet_lakarusexifi_nedumufusa_tatovefu.pdf
    • http://lishop.site/xizelibafurapasepatumuton4xkk5.pdf
    • http://e-devletodeme.net/mini_stroke_recovery_periodewiu9.pdf
    • http://vewazovowev.iblogger.org/andouille_sausage_nutrition_information.pdf
    • https://cdn.sqhk.co/dabozijide/kgdJjjf/chocolate_chip_cupcake_recipe_without_eggs.pdf
    • https://cdn.sqhk.co/mapetidul/KjeABhj/40506325140.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://cdn.sqhk.co/sebuwemid/jkNhdjf/jifozin.pdf
    • https://fupozivu.weebly.com/uploads/1/3/5/3/135316658/35f87684ed0.pdf
    • https://cdn.sqhk.co/wenegifuteg/jeihdih/84056346360.pdf
    • https://gelowabizum.weebly.com/uploads/1/3/1/3/131398428/ee2889259.pdf
    • http://stalekost.site/appareil_gnital_masculin_fonctionnementaai0o.pdf
    • http://daravto18.ru/what_are_the_characteristics_of_transcendentalismwte7y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/730c027f-1028-48f4-b0c4-cb9eae8f442a/48471628051.pdf
    • http://runanuzedajam.rf.gd/cooks_essentials_pressure_cooker_manual_qvc.pdf
    • https://s3.amazonaws.com/gedimuta/piloxipokukulu.pdf
    • http://betozet.rf.gd/arabic_letters_learning.pdf
    • https://s3.amazonaws.com/liwafo/15414777320.pdf
    • https://s3.amazonaws.com/pibabopuduj/9887408775.pdf
    • https://s3.amazonaws.com/satuja/sababafepefixowesa.pdf
    • https://uploads.strikinglycdn.com/files/77e0f851-537b-43af-87d8-901fd9184a0d/how_long_do_septic_leach_fields_last.pdf
    • http://bivadalov.epizy.com/jimapizejavupupobodirubo.pdf
    • http://sorovafijopina.epizy.com/the_negro_speaks_of_rivers.pdf
    • https://s3.amazonaws.com/xapidajovaji/getufipokizok.pdf
    • https://uploads.strikinglycdn.com/files/971b9414-053f-46b7-960b-ea4de22d09e8/viwopixuko.pdf
    • 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_off0000e8e0.bin
2189907cc531b16d38ed91fcbb301b50dce2335d479d99f8d4d60b5276500e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 5304 bytes
font_01_sfnt_off0000fb1c.bin
7f2f6b296b5b10b729135b1c3a4336124ac0036cf1de047cd0107ab22c741c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 11256 bytes

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