Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fd1febf5737215…

MALICIOUS

PDF

46.9 KB Created: 2020-11-09 10:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 74d38ce9d1eb42732f4aa4d0d9efe4ae SHA-1: 821ccf49b60bc55baf3b27e9a0b4f71fa7e7aa85 SHA-256: a4fd1febf573721573c1430e56db4cfa0e72fd22bdf24c32fb1be000db74f3c4
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafftec.ru/aws?keyword=ps+editing+app+for+windows+10 PDF link annotation
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/jowelawidebo_kovumibe_totesipefodu_xidunufup.pdfIn 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/9a6c5950-5c5e-4074-801a-649e00a4213a/72100032014.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/elaeagnus_shrub_pruning_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dc6ba9-7dcd-4d38-86f7-e3877794db5a/17475257692.pdfIn PDF document text
    • https://vejitigov.files.wordpress.com/2020/11/89870812250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc5ced7-ca66-40e0-ab82-a09e76dd7c2b/hypixel_skyblock_resource_pack_pets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519d628d-ff31-4e2b-a9e6-0fcc249c09d7/13526919720.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/faruwadora.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/human_anatomy_and_physiology_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/gupuwanijizavipuwadakaxi.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_off00007793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7793 5464 bytes
SHA-256: a532219b26287766a270b43d71fe8e6325ccec8e284575956310b69b69f3a96b
font_01_sfnt_off00008a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A57 10640 bytes
SHA-256: c853e6b8db3e2eb4940933378a0ee67694eaee2a6484733f20b813cbcab01c26