Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f16b56c204766d…

MALICIOUS

PDF

41.6 KB Created: 2020-10-06 20:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1e782408f73719e8d3305c977933c5a0 SHA-1: e46e315f0cb1b930d64889d2eb7de053d7ad9388 SHA-256: c0f16b56c204766d6d73f891bcf9cecf9d442155322fcd36a7be8580f24d9a7a
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://ggtraff.ru/strik?keyword=unclassified+cover+sheet+pdf In PDF document text
    • https://site-1039768.mozfiles.com/files/1039768/desokoxizeg.pdfIn PDF document text
    • http://files.revuekanyar.com/uploads/1/3/1/4/131437881/fexona.pdfIn PDF document text
    • http://files.stevebristow.com/uploads/1/3/0/7/130738771/4411240.pdfIn PDF document text
    • http://boler.dualworldconsulting.net/uploads/1/3/1/4/131406270/d425a145.pdfIn PDF document text
    • http://files.bennyjenkinsbloodline.com/uploads/1/3/2/3/132303133/a5174c2c.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/c0efc187-e874-4f50-8bed-4fbd14304945/xasesola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88693a4-e906-4f6c-b8cd-5e96e5b36db1/vofopukaxatifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65ea09a-c395-48ab-b9a0-9391ba950d9f/jakam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac6077d-e1b1-45be-8921-e10e97ae26de/sekasesaran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56c1782-efde-48dc-8331-475557f9dcb0/46868511079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b8c2f4-c09e-4d83-9448-4c1158ac99fc/rinafatevizolar.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_off00006431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5296 bytes
SHA-256: ae98a2c644e59412e4c83303854fbdaaed4f9404ea394002976e57fe09f95579
font_01_sfnt_off0000763c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x763C 10484 bytes
SHA-256: a47fab69e83dce0fbc1eabf65c21efe89ff123ce614d48e214691e641f7156fd