Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51fde5d620455a0…

MALICIOUS

PDF

87.7 KB Created: 2021-03-29 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d8c2af2c2e3932c32909deb76b62d55f SHA-1: bc376743196f274daa5830ef959a33ac88e0a86e SHA-256: b51fde5d620455a0b5f4a3dfc2b644693688fe846a0f503e2b51ca80915b21d9
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's a lure for free downloads, leading to a redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URL is the primary indicator of compromise, directing users to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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/strik?utm_term=difference+and+repetition PDF link annotation
    • https://xazupuve.weebly.com/uploads/1/3/4/8/134863790/3240988.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/reading_comprehension_skills.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/32411298028.pdfIn PDF document text
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/tufiwijaxaxozo.pdfIn PDF document text
    • http://dovujaxemedu.mygamesonline.org/one_page_birth_plan_template.pdfIn PDF document text
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/jidupodeg_laxepevatuwolis_jabadovedul.pdfIn PDF document text
    • https://nonoxatuvel.weebly.com/uploads/1/3/2/6/132681685/tugosedemaxolodida.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/zijivevip/audio_song_editor_software_free.pdfIn PDF document text
    • http://domumulavonevef.rf.gd/christmas_karaoke_songs_with_lyrics_free.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_d7c106f441e847b68e4a1c770325d2da.pdf?index=trueIn PDF document text
    • http://besipobewawite.rf.gd/15567273191.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/51110175816.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_2988f244778e4a039bb2ee18760b1983.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/zesalewaxabukokuzojiriw.pdfIn PDF document text
    • http://pavemamixazose.rf.gd/ajax_tutorialspoint.pdfIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_baade00e718f4f4ab07bad76fe22687d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/simpson_scientific_method_answer_key.pdfIn PDF document text
    • http://tuwoboga.epizy.com/67209785929.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/form_1023-_ez_eligibility_worksheet.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/iomega_ix2-ng_firmware_download.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/82500121054.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/draw_tite_activator_4.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_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 4940 bytes
SHA-256: 1afad42b317dd1f7926723207fba29021ae90151cbdc044f9f07630e867e7e0d
font_01_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 11496 bytes
SHA-256: 44dbd7e2e74d21d04268261e58cdef24e771f5ba1071d2a7fa3262bd96d00961

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