Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd4b0b31ef63b17…

MALICIOUS

PDF

41.7 KB Created: 2020-11-09 02:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: ad8d8c3e4fb403ffecc11187664b19fc SHA-1: ad5035b3c22da54aba10a36a69885d1429748458 SHA-256: 6bd4b0b31ef63b1746ed159d26b1326992999335fb571c0ecdac47e433b08c00
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://trafffi.ru/123?keyword=mentiras+perfectas+capitulo+final PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/vaxatapebexuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fa87f5a663c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/pegonifunonivupuwuvatejaj.pdfIn PDF document text
    • https://sazajade.files.wordpress.com/2020/11/fefofapexadomak.pdfIn PDF document text
    • https://sugadoden.files.wordpress.com/2020/11/tantric_massage_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/kadevatekirujugi.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/30883317342.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/sijusimiruvaze.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/7683031752.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/earn_to_die_3_hacked_google_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/64221617148.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/61198656540.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/24864730048.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_off0000607e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 5012 bytes
SHA-256: 89b14969534858faf90d7aa814d6851073321399b6d7e06efb11cf7717fc1197
font_01_sfnt_off000071a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A4 11804 bytes
SHA-256: 6c1a5c31b9a2a5b9ab92b8eab379acaee5b841eb4a690713823748c198bcbfde

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