Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd332de72e96d5c…

MALICIOUS

PDF

81.0 KB Created: 2020-12-15 19:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 21308678a3e4b87f13f164fca5c87ec3 SHA-1: 3772dde8c7b62d8ccee4e90fa471aa4c08f32fca SHA-256: acd332de72e96d5cd08c6abc79e01a3b85e4fff864b1cc5e8e784ee063f57875
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to redirectors, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly indicate this malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://trafficel.ru/123?utm_term=d%2526d+5e+how+to+determine+passive+perception PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529780/normal_5fb2f6467a3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_5fa83c5c41d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5fabed774784a.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/vaput.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f910c5271590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc728d4c43b171198891597/t/5fce20a71e1a4d7de1531653/1607344296182/sisavexur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56cb79955c744b559bb78/t/5fc9d8f6cf87d0256fee8403/1607063799176/kufemenobuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/fagisosugeletabegexem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c1e7c2-6f11-488f-a1c8-177c171e881e/gajakorukezavabagod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266b5f62-00d8-474d-87bf-c04dc4abbef3/xebegorijireziwulomoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e2a69f-2fd1-479c-a8c9-6f4c7d5a22e6/remivopivuramabat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/872acce1-c443-43d1-b8b5-d901cdffd925/padusedidozulefaralor.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 3120 bytes
SHA-256: 16a0685b1af8f7ff3286410c82d065b2ef9dd16f5cc5e004aadb0dd239daad33
font_01_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 4156 bytes
SHA-256: 278cac2e78d1b4950b7c4295bc4000fde350c7c8fc6a349bfdf9917f5098d62c
font_02_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 17960 bytes
SHA-256: dccabb7c0611714e2d4e939df7d4014cda7648a4c36d7198535a0d0db5469b41
font_03_sfnt_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 18196 bytes
SHA-256: f283d55b0e0b4fccc83021baed27b41fc361c9bcf0c9fe4ccbe84b318514c187

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