Malicious PDF — malware analysis report

Static analysis result for SHA-256 891a494319d65c14…

MALICIOUS

PDF

52.4 KB Created: 2020-08-17 02:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 02039f0cfdb44cdc5f438ecb36509eaa SHA-1: 1447f3da08ad74b20b762bcd9f5de956eb141ade SHA-256: 891a494319d65c1467cc1964888ff70910dfb121569b0462985c0785efaef226
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a link that redirects to a malicious URL, identified as a redirector for SEO-based phishing. The document body, though heavily obfuscated, contains text related to "Oxygen therapy guidelines for nurses" and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=oxygen+therapy+guidelines+for+nurses In PDF document text
    • http://razose.sharepointchange.com/uploads/1/3/1/4/131453321/sozobemigomezulubu.pdfIn PDF document text
    • http://files.ruanlanihorneparishcouncil.org/uploads/1/3/0/7/130739806/gepajamezolu_xezuxoxawuna.pdfIn PDF document text
    • http://febomata.ksrichardson.com/uploads/1/3/1/3/131380397/6913267.pdfIn PDF document text
    • http://files.bluespeedsalt.com/uploads/1/3/0/7/130740433/vitizenafog.pdfIn PDF document text
    • http://files.iskphilippines.net/uploads/1/3/1/8/131871772/duxosew.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/1/0428/9835/8432/files/26965864763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1461/7245/files/33502508495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/3976/3101/files/berenice_allan_poe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8089/3084/files/70226755914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/alice_in_wonderland_full.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3218/8840/files/39621670177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/tijibatuvutasinisatufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/26728884754.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_off000083e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 5500 bytes
SHA-256: 9d929b04ce24711ad286c59872ed4a68b07c86e6b829507dc4bd60edef8d3e96
font_01_sfnt_off00009695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9695 14872 bytes
SHA-256: 56091ff8585c37f2208bc231e3843bca5d77c883255e3eaea5cbb89882bd8264

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