Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed012d670fcd0df2…

MALICIOUS

PDF

73.2 KB Created: 2021-01-17 15:33:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0cfaaf65ec008a6ca67f676e6ece5058 SHA-1: 627cfb6e10da64099c5aefb89c91fd078384c14d SHA-256: ed012d670fcd0df27be21af3fc8e4aa4dfb40367e0cca0e233c46665d70fe50e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://traffset.ru/aws?utm_term=excel+gantt+chart+template+remove+weekends PDF link annotation
    • http://pepujolajerikur.66ghz.com/o_materialismo_historico.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/4hiQUpD/life_simulation_games_pc_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387718/normal_5ffd54f6b4645.pdfIn PDF document text
    • https://site-1176453.mozfiles.com/files/1176453/popojixopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5fa5b8a4734e5.pdfIn PDF document text
    • http://rumagadoli.22web.org/vefilurawix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f9920bcbfdcd.pdfIn PDF document text
    • http://jiludedo.iblogger.org/lodgers_tenancy_agreement_template_free.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/wifi_doesnt_work_on_my_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/Ehikrft/2495967630.pdfIn PDF document text
    • https://site-1229383.mozfiles.com/files/1229383/89681377746.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/JLih57X/86324940718.pdfIn PDF document text
    • http://nepifenimet.iblogger.org/58773168835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_5fba1e9624f15.pdfIn PDF document text
    • https://site-1084156.mozfiles.com/files/1084156/21455379313.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefuxaninegug.epizy.com/56566095893.pdfIn PDF document text
    • http://vosimamasi.epizy.com/noxagosig.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 5728 bytes
SHA-256: 415b1abbd692986f91da6e96b63d950d1441824b781eede4a03670c1d436c834
font_01_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10560 bytes
SHA-256: 86f2edf6fe8e20584a1407b1dd65ec73dc9be8c8413ecabb30466b16160f1374

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