Malicious PDF — malware analysis report

Static analysis result for SHA-256 412b7abd81e6fc0b…

MALICIOUS

PDF

70.5 KB Created: 2021-02-03 21:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 24d3e1721a133712c89cd165985ef946 SHA-1: 5f1ac194b01bd4d177e3e813c0dbea4d8f8ec81e SHA-256: 412b7abd81e6fc0b5235d8be852ee0c4162e31a680df18aead6dc7af81459567
136 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'aptitude questions and answers' and redirects to a URL that appears to be an SEO redirector for phishing. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wb?keyword=attention%20to%20detail%20aptitude%20questions%20and%20answers PDF link annotation
    • https://cdn.sqhk.co/sukurorezib/8fQjhgh/lorumotafasilelumad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_60161695f14cb.pdfIn PDF document text
    • http://all-host.site/chipper_and_sons_lumber_covohnw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_60090a0f05cf1.pdfIn PDF document text
    • http://ketrovk.xyz/como_ser_um_conservador_roger_scrutonoaw3g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382780/normal_5fdf690ccc0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5fdc871d843bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_6000ae87de9fe.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/2sVpvCf/41067282148.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/mudurixo/dmv_ny_permit_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/free_soccer_flyer_templates_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/best_caller_id_lookup_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/pomavuguvoxezetitixapoxor.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/rorurukawomajuwidumajuj.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/assets_accounting_balance_sheet.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 5160 bytes
SHA-256: 0ee7f6c2751e242859bd1687a5f2a01710d0d2c16dce284ca9c2910bbf92d90c
font_01_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 10236 bytes
SHA-256: 965edcac5668c71e085971e5aa8bf0dd39f89e16f9add62eaff2e77bdac06d68

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