Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c7a021df0ec1fe…

MALICIOUS

PDF

37.1 KB Created: 2020-11-08 10:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 35b7144273b41ce9355040a413933ecc SHA-1: 7995e139e9361b22209aa6e8f61d289f3fd9bd63 SHA-256: 51c7a021df0ec1fe57ec821173f82d45a51cf8f31131d7d481b4c84e5103d0ce
194 Risk Score

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://traffking.ru/aws?keyword=mardens+waterville+maine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5fa504752145b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f896261eb891.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/65d39747-e3c4-492a-95b9-c0b60d637b92/mugiwurixorozufiwifila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e766002-3ecc-4881-b632-2cac8c0e9148/publisher_bror_hazrlama.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/gun_bill_of_sale_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc75d36-3cfd-4562-8f03-193303808178/35899467114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7810056-f3df-48a7-8939-147604e353dc/xerox_workcentre_7855_driver_download.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/polukagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c641e905-be9c-43a8-ae1e-f93978bc9d23/3544954496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ea4a1d-bdae-4c0d-b232-7f8c52e41209/jajobaxobavufobelexudevej.pdfIn PDF document text
    • https://pawarasi.files.wordpress.com/2020/11/28501872127.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_off0000518e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x518E 5128 bytes
SHA-256: dcbc99d6ecba4c848c0e457bc215043b985e8f99693eabcc6538eea0b14e1b61
font_01_sfnt_off0000630a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630A 11156 bytes
SHA-256: 9f89ffe05a3be500ae1164f225275ff493227dece3f1a01d891e42a87371d866