Malicious PDF — malware analysis report

Static analysis result for SHA-256 765c35f8d0db253c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-12 16:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fe40d2a5b6b5c1e4bc8c4a67e93a8e3d SHA-1: 1c17a5355e548d3d35548a550081c8dc7d5ae7d2 SHA-256: 765c35f8d0db253ce139118825a83256ed3ce43e1d2d47a52a642e1de01505d9
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as a book download, but the primary link redirects to a known malicious infrastructure. The document body itself is heavily obfuscated and contains embedded URLs, suggesting an attempt to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of redirector links points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.cc/pify?keyword=livro+administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+e+opera%25C3%25A7%25C3%25B5es+correa+pdf In PDF document text
    • http://files.fortyukon.net/uploads/1/3/1/3/131379719/9029852.pdfIn PDF document text
    • http://files.theetherealdream.com/uploads/1/3/0/7/130739081/8581009.pdfIn PDF document text
    • http://files.iheartbookpublishing.com/uploads/1/3/1/3/131378921/7155802.pdfIn PDF document text
    • http://files.orleansraks.com/uploads/1/3/2/6/132681665/koxofijol-didal.pdfIn PDF document text
    • http://gabevev.foodandwinecyclingtours.com/uploads/1/3/1/6/131636725/wifatedururer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2734/9159/files/welixoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/wilesose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7386/2808/files/lekekawumawezutumalufazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/pexepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/22919731718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/titus_andronicus_sparknotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/lectures_on_macroeconomics_blanchard_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/92206974945.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/24803935243.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/basic_electronics_ktu_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/98197066904.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000635a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635A 5988 bytes
SHA-256: c71219f2c0adba6cdc67838895292dc570ceec90ab0ccf207b320089dc859830
font_01_sfnt_off00007640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7640 13844 bytes
SHA-256: 49dffc78bbe274872d0df2f0b2522d37b2fde73b15a98a87d2a5be694cfade6a

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