Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf88948e9f4c487d…

MALICIOUS

PDF

76.1 KB Created: 2021-02-11 14:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9adf15d24ba84d22f11c74f4e4c4dc02 SHA-1: e458054bcc74a6ab973b558e94b484c1eb5d0739 SHA-256: bf88948e9f4c487db5aaadde9c50d100911b4e294a346d49d94c08ef4f5bc647
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body and embedded URLs suggest a lure related to 'top 3rd person shooter for android', redirecting to multiple domains, some of which are hosted on disposable or free hosting services. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing attempt to redirect users to potentially malicious content.

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://druttle.ru/wb?keyword=top%203rd%20person%20shooter%20for%20android PDF link annotation
    • http://goloszauniver.fun/gamebryo_engine_downloadpklpi.pdfIn PDF document text
    • http://salestore.pro/38611013673qpjcm.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/ihhAjaF/90614741518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_600bfd0a276df.pdfIn PDF document text
    • http://cparta.moscow/memerebotufod5denx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ffccbb9c9a02.pdfIn PDF document text
    • http://losadodika.22web.org/galalimivurakaruduzopumij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488139/normal_5fd7f66ea7110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xamazaxalezamat.rf.gd/transitive_and_intransitive_verbs_worksheets.pdfIn PDF document text
    • http://palilipuxajiko.rf.gd/fish_farming_project_report_in_maharashtra.pdfIn PDF document text
    • http://dikubok.rf.gd/boom_beach_pc_windows_7.pdfIn PDF document text
    • http://wepaxilex.epizy.com/avocent_acs6000_manual.pdfIn PDF document text
    • http://migusopugaj.epizy.com/54136485468.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/bobrick_b-_165.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/tekasebonorasawavatakij.pdfIn PDF document text
    • http://kogosez.epizy.com/9094381882.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 5000 bytes
SHA-256: 724200de436e287712f5e4895b95147314fd3874a6cce4b50807c5ae422a8d19
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 10244 bytes
SHA-256: e4d28b491d297617aa07a892c44cdb11da4f2b5ad91579870d81fd00ccc10ee6
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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