Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee548324254f4060…

MALICIOUS

PDF

93.1 KB Created: 2021-04-09 08:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8d55b1627c2619302f8277eeb7e4f00c SHA-1: af8fd562be695d8ce9107795d993934b59bb7aca SHA-256: ee548324254f4060f46033bf4b7223da25b76c33793b782aebb513259fe24390
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a book title, directing users to external sites. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/strik?utm_term=libro+cuando+las+cosas+que+dios+hace+no+tiene+sentido PDF link annotation
    • http://sidikapefujuxe.22web.org/6248943636.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/IVygi33/46273035813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_606b7bc4c1475.pdfIn PDF document text
    • http://bumefivaloso.scienceontheweb.net/interview_questions_on_c_pointers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366655/normal_5ffd49b651156.pdfIn PDF document text
    • http://dompodklyuch.com/formulaire_virement_permanent_banque_postalewwqjj.pdfIn PDF document text
    • http://xekisegofisupo.22web.org/cultura_chachapoyas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_604412d820f83.pdfIn PDF document text
    • http://beliyden.xyz/2193584636injow.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/CjFuha1/93792282903.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/Hthckjj/24690712410.pdfIn PDF document text
    • http://gdztut.com/53316050271o2w6j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_6045f6797339c.pdfIn PDF document text
    • http://rabota-plus.club/continents_and_oceans_quiz_printable_freersxdf.pdfIn PDF document text
    • http://kedejusofapirej.22web.org/55470029459.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/OHiMXja/81415255486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borenuninod.epizy.com/76887735753.pdfIn PDF document text
    • http://muwuvago.atwebpages.com/3d_max_tutorials_interior_design.pdfIn PDF document text
    • http://kolofagigetu.epizy.com/quantitative_aptitude_tricks_and_shortcuts_free_download_in_tamil.pdfIn PDF document text
    • http://wuriwafu.epizy.com/akon_songs_all_free.pdfIn PDF document text
    • http://vudagolefedofa.epizy.com/tencent_gaming_buddy_emulator_for_mac.pdfIn PDF document text
    • http://lebidaxelu.epizy.com/metformin_uses_for_hormone_imbalance.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_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 5232 bytes
SHA-256: 88e6c771dc462ffcb52a50863fcc5d9e539b3dec204f50638487cb22350ebc1d
font_01_sfnt_off00013c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C66 12568 bytes
SHA-256: 20448385d6d071f3a797fabe3a3959a95e5c876a15ffb977206ab8df5ac06cae

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