Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cda3715d9f3378…

MALICIOUS

PDF

92.9 KB Created: 2021-05-04 09:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 56c988d2db99ff3b415b19dfd5c80fd9 SHA-1: a33e955672907a463eee86dcb01135a0cb12040e SHA-256: a3cda3715d9f337848301fe56e35e31ed9b4c90a7618c975afa21204598aaa75
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=thomas+mann+magic+mountain+review PDF link annotation
    • http://pesuloduf.medianewsonline.com/alimentacion_enteral_en_neonatos.pdfIn PDF document text
    • http://nobumowur.iblogger.org/biological_activity_of_benzimidazole_derivatives.pdfIn PDF document text
    • http://setopin.mypressonline.com/furotupoledojaguzotij.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/4264467.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/como_aprender_ingles_descargar.pdfIn PDF document text
    • https://kovelikazaw.weebly.com/uploads/1/3/4/7/134705675/suvibevenilezakil.pdfIn PDF document text
    • https://dibozuvoba.weebly.com/uploads/1/3/4/6/134692955/zatotojilevojexidagi.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/33595115344.pdfIn PDF document text
    • https://sifijaxamop.weebly.com/uploads/1/3/4/3/134332722/galoledek-tolubonek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiredosutozol.atwebpages.com/wubibijevusidedoma.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/adobe_spark_collage.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/business_productivity.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/como_hacer_un_organigrama_de_una_empresa_pequea_ejemplos.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/asp.net_mvc_4_for_visual_studio_2017_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/can_you_put_car_seat_straps_in_the_washing_machine.pdfIn PDF document text
    • http://sadoboxijowem.myartsonline.com/rrb_steno_syllabus.pdfIn PDF document text
    • http://xixivozute.myartsonline.com/basic_accounting_practice_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/ruwirim.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/european_cardiology_guidelines_pe.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/41276174657.pdfIn PDF document text
    • http://xetafenup.rf.gd/99661603775.pdfIn PDF document text
    • http://ginokaze.epizy.com/jenetiwixukufu.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_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 5280 bytes
SHA-256: af14ab36f8e2b8d3d6c984e616c16b649db88e15c465c63697120b7f5a42faf9
font_01_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 11128 bytes
SHA-256: 9ed7e472f3735c0e9465b89261318cd5fb5233182ad68f8ae10d14e683f5326e

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