Malicious PDF — malware analysis report

Static analysis result for SHA-256 701aa1c96efed2eb…

MALICIOUS

PDF

77.5 KB Created: 2021-03-25 05:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2880104ea2a18745a05d34d465c61291 SHA-1: 269d772c910f44a8da3fecf036e1e0e4518c6b24 SHA-256: 701aa1c96efed2ebddb37a2882490e844c50b0554fe41248ea2d310cb3c6fd40
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://s3.amazonaws.com/xamibebulosaxug/61007310966.pdf'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=calculating+angles+worksheet+pdf
    • https://cdn.sqhk.co/vefutifeves/UYwFvul/pazowuj.pdf
    • http://pebijuz.iblogger.org/practical_applications_in_sports_nutrition_6th_edition_free.pdf
    • https://cdn.sqhk.co/subetudagoli/ajfjgON/45826790860.pdf
    • https://cdn.sqhk.co/nuwuzasemifo/gG0gjx9/wumugabofowodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xamibebulosaxug/61007310966.pdf
    • https://s3.amazonaws.com/zebarufuridorur/92729891180.pdf
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_9f1ceec923714371a9a24b4348371ece.pdf?index=true
    • https://s3.amazonaws.com/lixuzo/zeguxafikadawof.pdf
    • https://s3.amazonaws.com/tufujifinobiro/plan_y_programa_aprendizajes_clave_primaria_cuarto_grado.pdf
    • https://s3.amazonaws.com/bidurudilidujug/nosomujidarerufabafim.pdf
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_76408af8c1594e48ab7eaaf2abbcc0d0.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/tinogedezotulafatibu.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_f4ac9d61e2584079918896aae672d541.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_27fa2c74903347b685e033418a19d1bd.pdf?index=true
    • https://s3.amazonaws.com/lofese/dupabosutetome.pdf
    • https://s3.amazonaws.com/sorogamat/guzenojazoxazim.pdf
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_e7c7a2884f5f49f8a1f48833f07fc5c6.pdf?index=true
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_c01e1fe17aae48f5b29ef5418206e93a.pdf?index=true
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_8ee66f40ef7045b2a2e9af120129a502.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_0e2f8632e48742ae8cbfe02a22f206a8.pdf?index=true
    • http://zunodorogagumit.rf.gd/15502310457.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_off0000f010.bin
5ddf73094fac6a791394f7a95a44761f4a89567ff07d771095ba5e9798475f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 5476 bytes
font_01_sfnt_off000102ba.bin
cd62368eaeee6c6be61a7d27d26278b0abd4a613c33117ab4f691cc8ba8d54c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 11420 bytes

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