Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a688c2c3a604460…

MALICIOUS

PDF

77.6 KB Created: 2021-03-11 01:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d6b730120a294c516633246245361cd4 SHA-1: 04834027bb82dced4ecf152b29a9efdf1cb045b1 SHA-256: 3a688c2c3a604460dfaddaaa999d817b8e6f6faa8a42979111c91cb1b8484513
164 Risk Score

Malware Insights

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

The file is a PDF that uses a lure related to 'Tally voucher entry questions and answers' to entice users. It contains numerous external links, with a critical heuristic identifying a "PDF_SEO_LINK_FARM" indicating a mass of external PDF links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/award?keyword=tally+voucher+entry+questions+and+answers+pdf PDF link annotation
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/3ac341b05.pdfIn PDF document text
    • https://silatasetexa.weebly.com/uploads/1/3/1/6/131637876/742cbca89f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_601d29089a9ae.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/bje6FIc/buwenolatinuzeraviso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_6043f8bd39663.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/gO62hcs/85887004989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_6027a1eeb706c.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/Cjeojii/26203032906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_60343521b85fd.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/agc9khf/hungry_dragon_hack_game_download.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/jexijer/a2dp_bluetooth_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/47717829409.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/xezevadovoxotudidami.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/jbl_flip_3_and_flip_5_connect.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/jutirakemukevudovutor.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/chrome_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/android_adb_drivers_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/how_does_figure_drawing_help.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/aviation_logo_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/76878961684.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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5572 bytes
SHA-256: b226d0d14f1f290d6e5378cb84aca01a6f8afadd0098d2cdba6eb39ea901185c
font_01_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 13268 bytes
SHA-256: b6606b68a9323df8d7b090a7de7e263fd8bd3b0091f4672fb4b5937dc2745af6

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