Malicious PDF — malware analysis report

Static analysis result for SHA-256 23267d997c5b29a6…

MALICIOUS

PDF

40.8 KB Created: 2020-08-10 23:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: befc97182c249d540284b47077ba1bb9 SHA-1: cdf3dd714abda2009d4a3d878dc552b8a735a8e0 SHA-256: 23267d997c5b29a61a3588d46813c7610d8d2faf55cb5693079dcbea4e484daa
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute spam. The ML classifier strongly supports the malicious nature of this document.

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=cisco+lab+book+pdf In PDF document text
    • http://files.theunfinishedsoul.com/uploads/1/3/2/7/132712088/daxibefonifin.pdfIn PDF document text
    • http://files.adventurehorizons.com/uploads/1/3/1/3/131383373/f28dfc0052eb5a.pdfIn PDF document text
    • http://benasow.chancellors.org/uploads/1/3/1/0/131070674/xotelagunonela-kelanobozowe-kovulu.pdfIn PDF document text
    • http://files.colorreadings.com/uploads/1/3/2/6/132682862/9ff7d.pdfIn PDF document text
    • http://files.thompsonphoto.co.uk/uploads/1/3/0/8/130814329/9681255.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/1/0435/3599/0936/files/genestealer_cult_codex_7th.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/muwadubofivaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/breeds_of_goat_in_nigeria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/xuvarotagigerobosavuzuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/xevugodidukilupele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/41590185913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/20584411917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/zefatebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/powejemepejonowojuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/nisexivalozuvuzake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/96230534422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/8977949217.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_off00006303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6303 5164 bytes
SHA-256: 3b0414b2df0ab79148d17e326520c175264573bd61479bc81fb321e3e93c84bf
font_01_sfnt_off00007499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 9844 bytes
SHA-256: 4cee1b2cd3a732ab231a052b63c38078afdaa7b3a68dcbdec337b1e1cc7176d8

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