Malicious PDF — malware analysis report

Static analysis result for SHA-256 2139ed76500b9f2f…

MALICIOUS

PDF

64.7 KB Created: 2021-02-25 20:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 2e353147a7674e67a8f1c27658b8f998 SHA-1: d8e15584ac099a032cf57862853be9d87efc62d8 SHA-256: 2139ed76500b9f2f8007ea234f74a3f39d7df6deaab1e0cfb76c2631e25c6adf
136 Risk Score

Malware Insights

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

The PDF contains a lure related to a common hardware issue, likely intended to deceive users into believing the document is a legitimate troubleshooting guide. The presence of external URI and SEO redirector link heuristics, along with a high ML score and ClamAV detection, strongly indicate malicious intent. The embedded URL points to a suspicious domain, suggesting it's part of a phishing campaign.

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
  • 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=microsoft%20wireless%20laser%20mouse%205000%20not%20working PDF link annotation
    • https://cdn.sqhk.co/tiwopaperuv/4gfhf2D/that_s_so_raven_cake_fear_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_603442d9478f2.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvezunotumu/aicemjc/21696549188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_601be0b860663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5fdfcaae5d8df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_602059202fd56.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/Z8hfOja/84547842357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_5fcf31e3c190d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_601e692437573.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/iggZ2ij/83197947141.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/radubozufiwo/juwidowepagewi.pdfIn PDF document text
    • http://pitepune.epizy.com/back_number_shiawase_album.pdfIn PDF document text
    • http://sijopar.epizy.com/armstrong_vinyl_flooring_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/39013529112.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/46453295195.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_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 5628 bytes
SHA-256: 5be8ae911954df275942e74e38200927656dd3e7c09ee7caf45b4c6aa3a9278d
font_01_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 10252 bytes
SHA-256: 0a7c53730debd72f7974a14f4ba3a9435fd55e1825fe101db9d03589c34664ee

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