Malicious PDF — malware analysis report

Static analysis result for SHA-256 159a04c888c74e76…

MALICIOUS

PDF

77.2 KB Created: 2021-03-07 12:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02261df31d572727ef5aec5b5754d7e9 SHA-1: a03403886127f475d67612d9f886bc18d138c119 SHA-256: 159a04c888c74e76b53ab709e59b7663d38341b6e648bdd97edf9ca458162358
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=goal+orientation+theory+in+education'. ML classification and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation, suggesting the content itself is not user-facing but rather a vehicle for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=goal+orientation+theory+in+education
    • https://cdn-cms.f-static.net/uploads/4403687/normal_601a1cc6e8a7a.pdf
    • https://cdn-cms.f-static.net/uploads/4493569/normal_60238df557cc0.pdf
    • http://trikotoria.ru/64448080945nubaq.pdf
    • https://cdn-cms.f-static.net/uploads/4455881/normal_5fe710d3deb6e.pdf
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fd694b43bbe8.pdf
    • http://cabinetshq.xyz/jugoxazafi81yc6.pdf
    • https://cdn-cms.f-static.net/uploads/4374838/normal_60144f6f3a0c4.pdf
    • http://libralab.digital/gixadanikanowek0y8l.pdf
    • http://pugeletise.22web.org/love_poems_for_him_long_distance_relationship.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ec3b032-ed62-47dd-a32f-0d9407c9ca81/kathie_lee_gifford_worth_2019.pdf
    • http://xanawuvogi.epizy.com/vorapudi.pdf
    • https://s3.amazonaws.com/xixonu/august_2019_sat_test.pdf
    • https://uploads.strikinglycdn.com/files/69a5f3ca-c29d-4174-bdf7-4bf63349ae61/blackbird_tab_baritone_ukulele.pdf
    • https://uploads.strikinglycdn.com/files/0ab4edc9-2808-47b5-b6fd-81162ce9417b/bepokalox.pdf
    • http://fasonumi.rf.gd/nordictrack_c950_pro_treadmill_for_sale.pdf
    • https://s3.amazonaws.com/ropuba/templateurl_in_angularjs.pdf
    • https://uploads.strikinglycdn.com/files/845e3821-fbb3-4e27-82ea-7a5cf0c20b3c/52374143587.pdf
    • https://uploads.strikinglycdn.com/files/87fbaeea-2a65-4fe2-a834-905d637508be/child_of_god_cormac_mccarthy_review.pdf
    • https://uploads.strikinglycdn.com/files/54051a17-7c8d-4a65-b383-bd7eb2733726/historia_natural_de_la_enfermedad_de_la_enfermedad_del_covid-19_de_leavell_cleark.pdf
    • https://uploads.strikinglycdn.com/files/001067ca-36fe-4b77-920e-983cb54be712/city_of_thieves_chapter_19_summary.pdf
    • https://uploads.strikinglycdn.com/files/8e6b632c-b2f1-413a-9e10-11ebad6337bb/cashflow_quadrant_full_audiobook.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_off0000f3fa.bin
351a662c581bd32cacfe6b59e95e8211a2f462ab0401958659bb08b3476f10c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 4980 bytes
font_01_sfnt_off000104eb.bin
12d276290ca1f29a2c5823d14b8df7be753ff76a6566f72bbdda94e1912ec857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10160 bytes

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