Malicious PDF — malware analysis report

Static analysis result for SHA-256 31524c65a94dfad2…

MALICIOUS

PDF

75.7 KB Created: 2021-02-13 23:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7d8da07e8a777947134dd4ea6ec51f23 SHA-1: 297d8d35e1aa1f09741b4fb399996d2a60857f4c SHA-256: 31524c65a94dfad2ef1467c30c6afba84c5f3a665269dc3fd9af40a9cafde5b0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains embedded URLs and a lure to install a browser extension, indicating a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains references to 'Android emulator online unblocked' and 'wkhtmltopdf', suggesting a social engineering pretext to trick the user into downloading and executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/wb?keyword=android%20emulator%20online%20unblocked PDF link annotation
    • http://fusubakitakudup.66ghz.com/lewuzufukewijuvoluluzate.pdfIn PDF document text
    • http://kewavixim.22web.org/15823419646.pdfIn PDF document text
    • http://novinove.iblogger.org/sheet_metal_auto_parts_manufacturer_in_gurgaon.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/88699bdba02.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/eh56ihE/aliexpress_hair_sale_wigs.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/8_point_uniform_hat.pdfIn PDF document text
    • http://bilapak.66ghz.com/bajivipilitikap.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/525699.pdfIn PDF document text
    • http://bifokagomasema.iblogger.org/classifying_quadrilaterals_worksheet_common_core.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisogifamesada.epizy.com/baginafox.pdfIn PDF document text
    • http://zuwewabarabin.epizy.com/calendar_2018_december.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/batekipurena.pdfIn PDF document text
    • http://kenugaderagof.epizy.com/57961304260.pdfIn PDF document text
    • http://wurasegato.rf.gd/entrepreneur_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/wijekexovobovuk.pdfIn PDF document text
    • http://retinibefefemo.rf.gd/26467003551.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/bakery_story_mod_apk_revdl.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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 5100 bytes
SHA-256: f8b2875aa564d0201ac4dc4e6dcfa4015bd501e846582ea438559396b7b521c4
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 10588 bytes
SHA-256: abcd45a9a1bb7f04bb52f4c0de76f36d4355f433326cd85fd1565f7e1f5d1ee2

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