Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc5ceca381a8378…

MALICIOUS

PDF

72.1 KB Created: 2021-03-21 11:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 099bfeba2e408f56ea0d7a4887a91e93 SHA-1: c4ecf8fca75f0999e8a4c7be172e23dacca3213e SHA-256: 4dc5ceca381a8378ee27583589f57f760b02964447bb3f03db0981be4fe4bcef
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a significant number of external links, identified as a link farm. Many of these links point to disposable hosting, and one URL contains a 'utm_term' parameter, indicating a potential phishing or traffic-driving scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/123?utm_term=ordinal+numbers+worksheets+grade+1+printable PDF link annotation
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/jolilowajudizid-vasevevejekow-nexijas.pdfIn PDF document text
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/327a2d373c79d6.pdfIn PDF document text
    • http://helplnstagramoffice.com/last_day_on_earth_survival_watchtower_electric_generators17wp.pdfIn PDF document text
    • http://marafonsport.site/how_to_use_a_youtube_video_on_instagrammldje.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/bixibamelol_kowojegidoji_lufap_reguwulosep.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/wadux_rimemowisowe.pdfIn PDF document text
    • http://lovemecompletely.com/jetuwesikudztzug.pdfIn PDF document text
    • http://bandalet.club/349862222586qsjs.pdfIn PDF document text
    • http://vumekakemimux.iblogger.org/nokobepudugudu.pdfIn PDF document text
    • https://zodutobaziji.weebly.com/uploads/1/3/1/4/131408241/wofof.pdfIn PDF document text
    • http://afracheat6.xyz/41454944761ka1fu.pdfIn PDF document text
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/65383f.pdfIn PDF document text
    • https://kemivepume.weebly.com/uploads/1/3/1/4/131407144/raxowaro.pdfIn PDF document text
    • https://zelareto.weebly.com/uploads/1/3/4/0/134096818/juzizakagi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinukafewu.epizy.com/aifd_guide_to_floral_design_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef1ef84-6c0a-4677-b3d4-39b8373d0222/qu_es_un_aforismo_y_5_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa9ec17-10ea-4ebd-a64c-7efe06eb6bae/wufujigerisofifodesaxalaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/how_much_does_old_navy_pay_hourly.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/bls_spain_visa_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462c1097-8f88-412c-ac0a-e8ed9719185f/46111055179.pdfIn PDF document text
    • http://wosozuwegarod.epizy.com/3048772.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/us_army_air_force_rank_insignia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7614e79f-c2bc-4bda-bb30-26d3d0cef88c/sebugi.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/wizogaxiguv.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/90506127577.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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 5748 bytes
SHA-256: 4707fe9206c57eb0626a1db73a5930fd58faf40cc26e6e82aab2c1ebda3ca491
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 9952 bytes
SHA-256: e9ed4a1af84f21e8fba51acb65d1466c24b622a6cd546b11f4575c229787bcd5