Malicious PDF — malware analysis report

Static analysis result for SHA-256 959efeb645a77ae6…

MALICIOUS

PDF

77.7 KB Created: 2021-05-20 23:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a82f4c19292dfa1bfa9dfe94f4b9e786 SHA-1: 62a3ea21987f531240279f71a3f4118d0f63b05b SHA-256: 959efeb645a77ae65ae39c44bddf0aa931b83df92f36d6677a3b7df520601337
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that points to a suspicious domain, likely serving as a lure for users seeking educational materials. The document body, though heavily obfuscated, suggests a 'math textbook' theme, aligning with the URL's parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://kuzutuzo.ru/strik?utm_term=libro+de+matematicas+de+2+grado+de+secundaria+contestado+volumen+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425924/normal_604e24094b8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_6061f7b26592c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452612/normal_5fee698a48656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_601259cd63541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_6027e4ed3a0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_604b8e23ebcbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_60176a9d73288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96a0122-a606-42d5-a5c2-cbfd72330147/bible_study_on_let_your_light_shine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29adf98d-831d-463f-9175-5feea43e1a64/how_to_remove_a_garbage_disposal_permanently.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d87de2-c36c-478d-be08-abbb0f12a0ed/zemigabejuwusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a701dc40-9ca2-424b-b7b5-bf67e6a6a71f/is_there_a_mango_clothing_store_in_toronto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5701735d-3452-45e6-aefd-824002813295/gofokatebivoteluzovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ddc44f-c0af-4796-a47c-5ffbc91deaee/how_to_survive_your_thirties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0c2053-9a4d-496f-9f84-365b9b839352/64715166035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3267e9e2-4586-4e5a-ad46-724428e1da30/menoxuxojegovuwibomase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e605c1e-87f2-4082-a1aa-d2598fa7f8d5/1982_honda_urban_express_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de5cd7b-3aa5-4608-8796-50c3c718dc83/pijepobofadolul.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 5584 bytes
SHA-256: e8c8479a8ac26e48552ec4ac9fbc791a6f011f41af88cbd36be8b4a542f3ca0f
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 13104 bytes
SHA-256: 1a2688dec0ac040ede1128c4689173f8d056c51bd6c2a0cb5918bc03129c1304

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