Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8d11a7063215d9…

MALICIOUS

PDF

83.3 KB Created: 2021-03-03 11:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b9e2a0fb4436cc1abb3a7b06066fdc8f SHA-1: 2fc94f92488368efe20ffbabad2ca50b486ccf94 SHA-256: 4b8d11a7063215d94d9518f2bf9a43e50b3cdefe76c2612b79e78661ffbd107a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to 'character sheet pdf' and 'wkhtmltopdf', suggesting a lure. The embedded URLs point to potentially malicious domains, indicating an attempt to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=morepurplemorebetter+character+sheet+pdf PDF link annotation
    • http://nosilekexiwot.mywebcommunity.org/mojaxawurinilolisalerodo.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/bookshelf_computer_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/ahfC45N/sabaxogogeratizak.pdfIn PDF document text
    • http://sexedate69.site/affidavit_of_loss_formqotp1.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/18012949768.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/ibgg7AV/nazudi.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/AjcXPjj/4616943343.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/ifhgqjb/wokenekega.pdfIn PDF document text
    • http://topstop.site/juxibabugs9o30.pdfIn PDF document text
    • http://copyrightproblem.com/asma_bronquial_pediatria_2018jwrks.pdfIn PDF document text
    • http://lazerepil.site/bedozutoteuc2qd.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/solving_word_problems_with_money_2nd_grade.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://bopulamumu.rf.gd/vofabunufanuvaduwen.pdfIn PDF document text
    • http://fukesok.rf.gd/gerixoj.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_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 5268 bytes
SHA-256: 14305428d4e020d8cad838f0c7c06df7b9c28fb9b2a0a895ade965968d918b21
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10568 bytes
SHA-256: de80f54acce620722d9f13f2af65f3de1e5441f71c8b16d3dda04ffb55f690a5
font_02_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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