Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a169d04c41f1d8…

MALICIOUS

PDF

72.0 KB Created: 2021-06-05 18:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7921b7ef0082f166f07411e5726c2dd7 SHA-1: b79e32ccfa701f4b95078445059195c63b0ec8a0 SHA-256: 26a169d04c41f1d8bfd466c745200ac405a04ea3ac60545fcb052a271ef0a278
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/pbw?utm_term=briggs+and+stratton+repair+manual+pdf
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/10d577b4358c1c3.pdf
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/jejojidaxotog_vuleg_noxorivevudut.pdf
    • https://vonazevuza.weebly.com/uploads/1/3/4/6/134603973/votutunijif.pdf
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/towixaweb-pifitabotel.pdf
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/puwekokakap.pdf
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/legusekuju.pdf
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/gexokikupoxadud.pdf
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/tuwifevi_mowaj_rasupinimem_jabegenolijamo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9be898cb-b056-4aa4-a951-bbc93dd4f5bb/wumuworakiz.pdf
    • https://uploads.strikinglycdn.com/files/03002d33-22a8-4c56-a845-e53a44caf1e3/what_is_praise_and_worship_songs.pdf
    • http://rijunepupuja.pbworks.com/w/file/fetch/144603420/troy_bilt_horse_repair_manual.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144424428/kr_gopalakrishna_engineering_drawing_book_free_download.pdf
    • https://uploads.strikinglycdn.com/files/06d4ef89-6dbf-4580-b6c5-6c754afafade/puwulasuzuzimu.pdf
    • https://uploads.strikinglycdn.com/files/6564e533-0fb2-4b61-9e80-6ce78a5257ba/tulabo.pdf
    • http://ronefete.pbworks.com/w/file/fetch/144490551/suzuki_jimny_workshop_manual_free_download.pdf
    • https://uploads.strikinglycdn.com/files/7a46eff8-9d57-4b5e-a8f1-bf0876ad8e0c/mawepiz.pdf
    • https://uploads.strikinglycdn.com/files/16a0600c-773a-41c7-a278-4f9a87a9a85f/how_to_make_an_appointment_with_dmv_in_virginia.pdf
    • https://uploads.strikinglycdn.com/files/14943a5d-72a0-4638-8373-380f835b53f9/50363303862.pdf
    • https://uploads.strikinglycdn.com/files/e77d14a8-6473-4786-8b9f-55b4ba57bb2c/red_rising_trilogy_order.pdf
    • http://zigunef.pbworks.com/w/file/fetch/144455574/fugesokuvawulovojoka.pdf
    • https://uploads.strikinglycdn.com/files/bbf80763-ce52-4786-929d-38fdf6b3e388/ejemplos_de_radicacion_de_numeros_reales.pdf
    • https://uploads.strikinglycdn.com/files/7752c72e-ab21-47bc-9c62-b569f0a9cc29/57272655479.pdf
    • https://uploads.strikinglycdn.com/files/5a3e46e0-bd74-4b8b-89e0-cb4044c68f46/char_broil_grill_vs_dyna_glo.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_off0000dd7d.bin
d4952d494831d27a9622de6e496fb61b818ee365898b19fb0d102fde6fbc884b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 5408 bytes
font_01_sfnt_off0000efd2.bin
090142aece2b49cdcdda557073a6773cb1b20affaa6916ed694a284b631564bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10216 bytes

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