Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebf9b1cfbaed51f…

MALICIOUS

PDF

104.8 KB Created: 2021-03-19 05:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2f1077cf96ac742966f57fbf486b09c8 SHA-1: db16ea4024df63341a9142874cf84eef44a0b8e5 SHA-256: cebf9b1cfbaed51fe0884fd785e2e385709fd6d1d2b71c70b6297e91cbef0259
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a URL that promises free downloads. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://pelibifir.ru/aws?utm_term=cbt+handouts+for+anxiety` is the primary indicator of the phishing lure, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/aws?utm_term=cbt+handouts+for+anxiety PDF link annotation
    • https://cdn.sqhk.co/kosadara/nqGicjc/kijotuwekorinuxekager.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/licjjQU/m134_minigun_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/vinusubat/CBfjjNs/how_to_make_slime_videos_on_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/yhipxhd/63578079989.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/gjdiiii/project_management_certification_online_cost.pdfIn PDF document text
    • http://penageli.getenjoyment.net/54906458888.pdfIn PDF document text
    • http://vuletotam.scienceontheweb.net/nosumumatebuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/jhjb74v/vumekuzek.pdfIn PDF document text
    • http://vutunema.mypressonline.com/xerosojamosuzixir.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/i0YW3jj/57062906593.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/makkar_ielts_speaking_2020_free.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/eb2b2190-42fc-495e-b507-ed532b86bf90/29988125295.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/las_cronicas_de_narnia_4_pelicula_completa_en_espaol_latino_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/78484868613.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/jaxefipovijulawitinoneku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af67f0b-c128-4351-81b2-385d9873b0fe/what_is_osha_30_certified.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17591aca-de97-442c-8f53-b3a2c2fdff34/why_wont_my_dsi_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21675b9c-c335-408e-a6c8-e5c7bd85038c/why_is_my_ice_maker_making_loud_noise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17b704a-4fd7-4b02-b488-6c72c2267647/is_the_kobalt_table_saw_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/tu_jaha_jaha_chalega_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acae18b-6a40-4d8d-96a4-7baf68eaec8a/30202502631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27452bdb-dbc3-41bb-907b-f5aa4d86dfb3/80856216819.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_off00015c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2E 5180 bytes
SHA-256: d6d1007fd77a14087cd741d8bb0953216131fe4b06a9286a652efbb0d24a26a4
font_01_sfnt_off00016dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC7 11332 bytes
SHA-256: 11b4e80a013430f8dcf4a7ef4e56abe4a53f08cb4a8af546719fac968736488f