Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffeab3876505ffb…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 14:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: caf2a18e28e3b761b540ff4c5ccba5de SHA-1: be1f52bee58a84565bee502c75851ab1295780a8 SHA-256: 8ffeab3876505ffbd47f0106b03886c9cac44f096dd50879058dccfb8009675b
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=descriptive+research+method+pdf PDF link annotation
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/54dd4f1d.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/5031782.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hgzZezn/words_in_a_pic_2250.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/hgm6d5A/cardiac_arrhythmias_interpretation_diagnosis_and_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/03uigqY/liwibamajanitenetaza.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/jiZhf3n/88212610643.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/gijicmn/kisavipixexajaxukow.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ijg6y0u/10777538821.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/gjAHgif/extreme_car_simulator_2016_android_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/jgPqAyl/bapef.pdfIn PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/zuzorewined-josediw-wivegore-majafex.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/81c9c9.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/rjgEJjh/best_offline_survival_games_for_android_2020.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/3f7322ea-9d92-4919-88ab-d6dc3c4c77d2/11705393851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40de2993-3121-4b4c-a37e-6043cf2631f1/esio_trot_film_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75cd62e-39fb-4dcd-99c6-e3141232de7c/5625210469.pdfIn PDF document text
    • http://ligexaxo.epizy.com/non_profit_organisation_business_plan_template.pdfIn PDF document text
    • http://bufopalepigugu.epizy.com/how_to_argue_in_an_argumentative_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282803c5-224c-4d94-b827-8f2e80110507/current_issues_and_enduring_questions_12th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b51a6dd-d6a2-4ff8-a9c1-8a4c4efb2d8b/mexunogogufofeta.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/nvidia_shield_4k_hdr_android_tv.pdfIn PDF document text
    • http://xegukamadoso.epizy.com/5983819990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bd8970-a6cc-4680-91d7-3433df076747/genie_powermax_1200_setting_limits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbf586b-9554-4861-a02f-5ae39f8f3fc2/nivajugevakewomuwub.pdfIn PDF document text
    • http://wupuwijekoja.rf.gd/37209945634.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_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 5424 bytes
SHA-256: 744444c72aedefa23fde4f13e0c358d39e9d41da9d160ef6bfa9fdb2e01a245f
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10688 bytes
SHA-256: f3a4c9f02994305ab6b5171f1bd05f7414928c0952bbcedc09f74a2f2dfe4f80