Malicious PDF — malware analysis report

Static analysis result for SHA-256 761eb19beab3b55e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 17:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8931300aa1132497daf846bbf306e965 SHA-1: 9f750b7be66a7de01722c83e3a329921cf613516 SHA-256: 761eb19beab3b55ef55980c3c4fcb42df4db84e5cde0fda50854e49303593718
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve as lures to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=android+developer+options+warranty
    • https://cdn.sqhk.co/zarepowake/ajjNiaA/hair_salons_near_me_open_monday.pdf
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/pudazavibokebeje.pdf
    • https://tezugigawezen.weebly.com/uploads/1/3/4/8/134878192/9263540.pdf
    • https://cdn.sqhk.co/xozirijor/irjbghB/ben_10_ultimate_alien_hd_wallpapers_1080p.pdf
    • https://jaxuvoxet.weebly.com/uploads/1/3/5/9/135979876/damiko_ruriwara.pdf
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/1202751.pdf
    • https://cdn.sqhk.co/pawosuku/gfriiiI/air_fighter_online_game.pdf
    • https://xosifuto.weebly.com/uploads/1/3/4/8/134891486/141eb7867.pdf
    • https://cdn.sqhk.co/bijilixiger/8jeijs7/grumpy_cat_goodbye_meme.pdf
    • https://jiziweradufib.weebly.com/uploads/1/3/4/8/134847172/borudi.pdf
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/wanalagodujug_gizomow_sadisegolola.pdf
    • https://cdn.sqhk.co/godezixibufo/hewTEZN/pastimes_pub_grill_columbus_oh_43085.pdf
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/6723888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xesigeze/7989743938.pdf
    • http://bekabugi.epizy.com/mandalorian_ep_2_recap.pdf
    • https://s3.amazonaws.com/gomaxod/star_trek_into_darkness_free_watch.pdf
    • https://s3.amazonaws.com/gateme/what_is_gnostic_mean.pdf
    • http://gijaguvid.rf.gd/crofton_infant_school_ofsted_report.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/panasonic_pbx_telephone_system_contact_number.pdf
    • http://sedoguzod.rf.gd/company_id_card_template_psd_free.pdf
    • https://s3.amazonaws.com/zunaduxa/82142462028.pdf
    • https://s3.amazonaws.com/regovadeje/go_math_grade_4_workbook_answers.pdf
    • https://s3.amazonaws.com/gixawetopoli/13566570726.pdf
    • http://somupoxalinarek.rf.gd/bodyweight_workout_plan_to_get_ripped.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f795.bin
fe7398c7ec0b3809793f9dcc69ac3145f3d92648f1e262a010bff171c082cfd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 5196 bytes
font_01_sfnt_off0001096a.bin
9064310c2cfa9808d5bc5e7f761163f32339d7a4fb828dab789398277e446fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 11448 bytes

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