Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2affaeb6d858c8a…

MALICIOUS

PDF

67.0 KB Created: 2021-02-24 19:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ade850b9ad99b0dc1627a09650e8bff SHA-1: 063f2818bb24701ce893ac84140c21bc87e72365 SHA-256: b2affaeb6d858c8a8b003ac60b1baf8863b4975f48cb9bd4b40c37f75221bf30
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous links to potentially disposable domains suggests an attempt to host malicious content or redirect users to phishing sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=verb+tenses+list+regular In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_602d3119d439d.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/bijumoresoxulijutu.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/density_calculations_practice_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_602f096e94dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501995/normal_601e225fe3d8d.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/fjjHhjE/wafemuj.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/what_are_the_best_cordless_phones_for_hearing_impaired.pdfIn PDF document text
    • http://setavifisotater.22web.org/autocad_2013_xforce_keygen_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabepevid.epizy.com/81968570442.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/monthly_calendar_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/blockchain_for_dummies_filetype.pdfIn PDF document text
    • http://jelugubafegoj.rf.gd/51849080324.pdfIn PDF document text
    • http://sunosazogefot.epizy.com/filter_queryset_django_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/patti_smith_because_the_night_sheet_music.pdfIn PDF document text
    • http://budokukikaririd.rf.gd/bahubali_2_in_tamil.pdfIn PDF document text
    • http://duwamiwimi.rf.gd/sepafesovasiwomokufu.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_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 4960 bytes
SHA-256: 3d0ecdcc805d2953ef2a490a9e170092ad7a6a5d422f4c8f5727ac2b5bf19a40
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 9488 bytes
SHA-256: 69bd7c57b83ded3d5ef9b9d74d2a90f9c7efee6f431dae6ad27c54dc6c5c2a52

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