Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8db25fa390b303…

MALICIOUS

PDF

82.2 KB Created: 2020-11-25 07:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f7feeb81be51404fb004270176609cb6 SHA-1: d5010bc93f272c47d1e62bf4c1a031661f7f30cf SHA-256: dc8db25fa390b30314f258f95675a7f7c6b1678da33912965002b9fd67d91144
134 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to known malicious redirector infrastructure, specifically a URL used for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure for a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://traffking.ru/strik?utm_term=phr%252Fsphr+deluxe+study+guide In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1082d919-6c55-4dd5-b4bc-c486ade4761b/funcion_valor_absoluto_dominio_y_rango_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/cranial_nerves_and_their_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/amilcar_cabral_political_thought.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/nanokalujef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80b6b4d-711d-4275-84d7-2fd8f9258471/letatuxuratikif.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/25486060943.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/sabc_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a56b34a-2787-4911-babc-9ad853484629/lexotixapabojinasop.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/47958745837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050733eb-1e63-4356-a1e6-1cac29a1afbc/hcps_report_card_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/cheats_of_gta_san_andreas_download.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/la_ultima_cancion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644f98af-22f3-4441-840c-454f8d3166a6/catcher_in_the_rye_review_questions_and_answers.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_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 5220 bytes
SHA-256: 18b6386197532aad5c8a160d0d347692b07bba3ebfe3e1cd62a06c620be274cf
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 11508 bytes
SHA-256: 5d4435738e5e2971b5d53e19837c901b93c24e759d2efbbaf043123503a1dc09