Malicious PDF — malware analysis report

Static analysis result for SHA-256 51075ae3907ec6d4…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 06:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6725bd564063d0c4dca14f5ebf5a71ae SHA-1: 655e157611298936f92e97004a134aeb8a129eda SHA-256: 51075ae3907ec6d48b01e6c4f4b71bd4a2d0749449e30eb6ad8df11cb03f96c9
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 a heuristic identified it as a link farm. ClamAV and an ML classifier flagged the PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://kuzutuzo.ru/award?keyword=moravagine+blaise+cendrars+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392862/normal_6030d9c289744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5fef81b970c69.pdfIn PDF document text
    • https://wunapeno.weebly.com/uploads/1/3/4/6/134621426/ec24c32567e.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/4913233.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/basics_of_chemistry.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/addicted_to_pain_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_603cb03d0a3e9.pdfIn PDF document text
    • http://pijubunoze.22web.org/honda_lawn_mower_engine_parts_manual.pdfIn PDF document text
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/1573527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_6047c943c2486.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/kalender_2020_veckor.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/19913090870.pdfIn PDF document text
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/40e1bb5ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_603b5876914f9.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/a5c95.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/jk_bank_exam_book.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/prayers_that_availeth_much_healing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/harry_potter_and_the_philosophers_stone_netflix_australia.pdfIn PDF document text
    • http://lujobopuj.epizy.com/call_me_by_your_name_free_online_streaming.pdfIn PDF document text
    • http://jutebef.rf.gd/cheppave_chirugali_mp4_songs.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/cazadora_de_hadas_saga.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/39_articles_of_faith.pdfIn PDF document text
    • http://jemadetuv.rf.gd/61315051745.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_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 5528 bytes
SHA-256: dcb8fb56749b358e6775917fe3a956f9622a021c7423a4d0c149baa3b7ede245
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 11556 bytes
SHA-256: 38fcd40cee20035825fe07a91c82d55c879ac55772510f7b36cb11b8491749c1

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