Malicious PDF — malware analysis report

Static analysis result for SHA-256 017735886ec9b221…

MALICIOUS

PDF

56.2 KB Created: 2020-10-02 04:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cdf4b6820fcf31510e143bed8f1837ba SHA-1: 2badbb56d9685c34c9ce24eeeb1b03cae6de97c1 SHA-256: 017735886ec9b22126eaae0b3d10605807925bf129066c2051e6a33910104f32
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=calculus+and+its+applications+11th+edition+pdf+download In PDF document text
    • http://files.partydoodle.net/uploads/1/3/1/6/131606128/230ee3e8eb905.pdfIn PDF document text
    • http://files.stmarysandstjosephs.com/uploads/1/3/1/4/131438389/2204608.pdfIn PDF document text
    • http://files.alisondowell.com.au/uploads/1/3/1/4/131454352/2436010.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/0d6e2db2-2376-4670-b9ae-aa6070874591/56647631540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976e0b75-fae4-4706-9ecd-2d6ceddec815/sejezizukigowujopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d46883-2248-437e-bb70-2f7fd193e1b2/85236907672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a73da31-db65-4e8c-81be-eac0ad4154bf/47439400366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dee2f2-bc8d-4ffd-9f54-edf2972785b9/26740856922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a09173d-8756-4c4d-9655-18d52d41aed2/werusajunagogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a3b4ca-a041-47ef-abc3-5d15da83b2ca/11507917102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a27e087-e01f-4a62-bf8a-41059c9e5554/94330752356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c56c06d-d756-4beb-ae09-051da6441ab1/22388013318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8fede8-54c9-4886-af91-e6d447e946e3/wefuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a835e78c-a8ed-4c77-bd79-3509d74f6e2e/xunujaguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a308ac0-c523-41ba-ad37-57ac51190447/zekogasok.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_off00009b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4B 5196 bytes
SHA-256: 2d5952da848ee02480d188e2c056235e8fe29e19fe51aacfd5415eba08187fa0
font_01_sfnt_off0000ad0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0D 11248 bytes
SHA-256: 36cd0c6fa831c3b4c17c7fbcbac7ac60c9fe9270fa12ac5f24ca79ef13e3cb28

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