Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4ec73ff0cbce07…

MALICIOUS

PDF

79.9 KB Created: 2021-04-02 08:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 56dbc0c5559ff420eb7d2825a74c9021 SHA-1: b13bc503184307cf7ee0f66b60430e8ab5681565 SHA-256: 2f4ec73ff0cbce079b46b47377c83de105c47f743329504b0d8c36f0cfea1385
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Tera brawler crystal guide', directing users to a URL hosted on 'maypoin.ru'. This indicates a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=tera+brawler+crystal+guide PDF link annotation
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/sofutaverumud.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/govor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_6034c339c01ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_60499a2553d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_605feaa997192.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/wazuvomorowagidi.pdfIn PDF document text
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/c667ee077a999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_600a3f364ece7.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/c93ae54feb175.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/zikomaluzadoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_60550d84ac9a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/rifaronele.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/candy_crush_soda_mod_apk_200_moves.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/gubeluzovatavuxebemo.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/paxejevowuzonalamegabavid.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/fe_chemical_review_manual_lindeburg.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/redwall_book_1_audiobook.pdfIn PDF document text
    • http://sewegex.epizy.com/tilodiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/rutepupemimanazut.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_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 5392 bytes
SHA-256: 7e358169bd89ec2631cfa3f5c90ea4a9f2471a65b3520851abc0e810658ab1ac
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 10840 bytes
SHA-256: 4803c93ce643cc8ae2dee27000fd254ae464d8e08e50f9cb1f36ae158be90033

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