Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbde49be9e6a13c6…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 20:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d663b209cbd4d1dd98a1b44514a8718d SHA-1: 51ed89181d160919b2b572ee0747b119a2611bed SHA-256: fbde49be9e6a13c6f5ad0ed0b8a2f096549ec4c942fdd936c780a1e1dad948c3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://dugedepap.ru/aws?utm_term=is+ultimate+spider+man+good PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481068/normal_6018cf8913db2.pdfIn PDF document text
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/7646941.pdfIn PDF document text
    • https://lekamenofujilap.weebly.com/uploads/1/3/4/6/134690267/fanunegosinaxajukam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_602cd72d1522d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_6039b8bea4b84.pdfIn PDF document text
    • http://fajutixosisi.22web.org/appbounty_mod_unlimited_points_apk.pdfIn PDF document text
    • http://judijemavup.22web.org/m._a_english_date_sheet_2019_bzu.pdfIn PDF document text
    • https://jeliwowad.weebly.com/uploads/1/3/4/6/134600639/dudumudofiz_tuzixo_rekapuvus.pdfIn PDF document text
    • http://dujegud.getenjoyment.net/figujuzunonugatu.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/zuboxiruru-moniditiwa-jigikoneko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwiweranewu.rf.gd/ditafelufo.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/55287735579.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/94412012937.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/savojebapesidikor.pdfIn PDF document text
    • http://rudurugineme.epizy.com/alaye_mi_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/ririvokepavotebezomiruked.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/83724887962.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/how_to_connect_logitech_h600_to_laptop.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/concepto_de_qumica_orgnica_inorgnica.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_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 5216 bytes
SHA-256: 83adad491f967ecfbf8a9b90b76b14fe8e1c2a7349a7cd6c18166cf50d6ccf65
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 11984 bytes
SHA-256: 77022d94030141d07b1d29ff84748a638694463477c52b1a80d44462f18e7451

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