Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd45c1503150dd66…

MALICIOUS

PDF

81.5 KB Created: 2021-02-22 04:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8801c7d0e718694da0bdbd5bf1d353f4 SHA-1: 34b6d2feda35d2e8550f292180d20da380e87215 SHA-256: dd45c1503150dd663721779f95f756c6f03d5408f7b4361a005660b040aa9e6e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain text related to a popular TV show, likely serving as a lure to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://crophysi.ru/123?utm_term=star+trek+discovery+season+3+episode+5+release+date In PDF document text
    • https://cdn.sqhk.co/mekaxosur/iibhbhi/black_panther_costume_diy.pdfIn PDF document text
    • http://fitokapss.xyz/solid_state_physics_so_pillaio3h9v.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/dZ0jahg/fearless_bmx_rider_2019.pdfIn PDF document text
    • http://pubgmobiie.com/angularjs_directive_attribute_without_templatexoe6h.pdfIn PDF document text
    • http://ita-talia.fun/welch_allyn_otoscope_71050_manualu22cf.pdfIn PDF document text
    • http://dojaligiwojop.22web.org/86759135151.pdfIn PDF document text
    • http://fenotowibezusen.iblogger.org/16433788640.pdfIn PDF document text
    • http://portkamesto.site/phonics_learning_bookshwopg.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/PhOhhb8/arizona_shelter_in_place_order_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe4f662c91d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxizetugo.epizy.com/sunamugutozemuvowiwit.pdfIn PDF document text
    • http://weforonezanofo.epizy.com/sokosetano.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_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 5684 bytes
SHA-256: 29e03194d394c066608ac76f0da64e42e82704c0d0e997fd22661c702a6a1797
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 11672 bytes
SHA-256: c5745f382ed3a058c94cb650a714af8280a2acba5571ade6efc523febebcda38

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