Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aef0783ed18d7f9…

MALICIOUS

PDF

71.2 KB Created: 2021-03-28 00:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6a26d72f9d552218497eba59b05ca365 SHA-1: deccc998649baa84fc8bad114817c19b4a67cbc2 SHA-256: 5aef0783ed18d7f9d60671238f230a78a13c3f2322a4d2f3b8ffaf158b64b0a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm detected by heuristics, suggesting a phishing or scam attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+replace+electric+stove+with+gas PDF link annotation
    • http://wowezixuxaxu.22web.org/busqueda_de_informacion_definicion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_6007ba8f3bb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450501/normal_6048d37bf08ce.pdfIn PDF document text
    • https://gisoxesasolide.weebly.com/uploads/1/3/4/5/134590405/kuzaf.pdfIn PDF document text
    • http://lilidabegib.22web.org/alpha_test_bocconi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ffcb3c828c6d.pdfIn PDF document text
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/pududovarez.pdfIn PDF document text
    • http://rusefogotomik.iblogger.org/subordinate_conjunctions_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/62317730544.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/62690996361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1422754e-d991-4a65-abb3-e9006c9a31d7/9881919961.pdfIn PDF document text
    • http://feduvilez.rf.gd/understated_calendar_template_2015_publisher.pdfIn PDF document text
    • http://joxepivebafugig.epizy.com/karutib.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/10062000659.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/dear_evan_hansen_sincerely_me_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ec8614-d00b-42bd-8029-86bdda2576ec/573614592.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/wiwusajojaridorame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c71c41d-2022-44e2-a4fb-27526f3fe024/how_to_work_a_dressmaker_sewing_machine_brother.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/curso_para_aprender_a_dibujar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d723c81-df4d-4edb-83c2-e16361024a34/3287604491.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/agrobacterium_plant_transformation_protocol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7242040-4be4-431a-a819-3de5b8e37db6/kadulonetewufibamaxebod.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/4202059686.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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 5308 bytes
SHA-256: c20dafe17a5681b3c9cb4d3fe9c5410858ff3fd9bf853096ba46c55ae607dbfd
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10940 bytes
SHA-256: 98a744c7709a6e06747c97fb986db588de3b3c662614032d7abc19005248da97

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