Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead66a57bac422b0…

MALICIOUS

PDF

72.7 KB Created: 2020-10-01 17:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 2b033907b022792034bedc301b3870f2 SHA-1: da1a34b3ab75d8484ddd29ec5a7de42ded2cdc36 SHA-256: ead66a57bac422b01bbbf036335ff246314f9f80db0b77a9a6dbfa32bd5464ac
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=yayati+marathi+book+pdf+download+free In PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/99587135861.pdfIn PDF document text
    • https://site-1038421.mozfiles.com/files/1038421/68727286212.pdfIn PDF document text
    • https://site-1040373.mozfiles.com/files/1040373/xujufibanuj.pdfIn PDF document text
    • https://site-1036855.mozfiles.com/files/1036855/63241751662.pdfIn PDF document text
    • http://xuled.comprehensivewellnesssolutions.com/uploads/1/3/1/4/131413418/rovivatipazi-botugisuda-pijuput-lipajojudowu.pdfIn PDF document text
    • http://tepojij.letstalkfoundation.org/uploads/1/3/2/6/132681887/nizumozemujesemi.pdfIn PDF document text
    • http://togurowu.homebyhayley.com/uploads/1/3/1/4/131483229/e53dbfd9d6f.pdfIn PDF document text
    • http://files.uogcbssc.ca/uploads/1/3/0/8/130813757/meguzad_bipasoguraj.pdfIn PDF document text
    • http://files.cqschoolsjazzfest.com/uploads/1/3/0/7/130776268/9b9b5.pdfIn PDF document text
    • http://files.5-s-poodles.com/uploads/1/3/2/6/132695244/fukobetusoli_zasadole_togigig.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/6d7f6c30-0ffd-4090-8261-bd198829def3/jiledowigejaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f73e557-b2ca-4101-a7db-55b19ffc3165/ruderovusitunoxepisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940e21ef-cd6d-4e45-94a1-1eb53e681c98/49259684324.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 5464 bytes
SHA-256: f2454092aa0fb48ba9f72eaa41ac163baab68d2289171d4fa42e1cac3164c712
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 13828 bytes
SHA-256: 0ef636196a2d169b7295fb5509fae07f6330bfa0ebc0013087b05750692cb9ac