Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c7c432b25dd6cc…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 06:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c382477138fa8e90cbc7bff815f4ec8c SHA-1: 09732ade781db227f4beeed545e66a3d34e75b19 SHA-256: c8c7c432b25dd6ccea42d891c5d5f3985c3f82df64577004b4a312b8edf6bc4d
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kuzutuzo.ru/123?utm_term=fiction+or+nonfiction+worksheets+grade+6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473637/normal_60064b597b05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_6019d680089f3.pdfIn PDF document text
    • http://uablog.website/82915665996flpmp.pdfIn PDF document text
    • http://ctuxuu.com/kamuniriwejuvawegat7d6q2.pdfIn PDF document text
    • http://good-production17.site/werezudizarirokavukb6rnt.pdfIn PDF document text
    • http://shoop-fr.ru/field_attachment_report_cover_page8kv9g.pdfIn PDF document text
    • http://mbfsopg.com/27251306005xkq4i.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/decrease_file_size_adobe_reader_online.pdfIn PDF document text
    • http://leree4.club/q_hace_el_sistema_linfaticogjg4x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_601fcec4c4bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60234b5e2d90e.pdfIn PDF document text
    • http://silkhfig.bid/nabewakibiveraraysuks.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/triangle_congruence_test_answer_key.pdfIn PDF document text
    • http://dokojekiferej.mygamesonline.org/felexesidamubewo.pdfIn PDF document text
    • http://50offshop.info/21269273519g093i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rakulewozagax.rf.gd/89993686527.pdfIn PDF document text
    • http://xalixonawi.atwebpages.com/64519609260.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/11824745494.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_b37651e2b1004cc28c756d08f5104b7f.pdf?index=trueIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_43d75c00734e4f5987bed0fb4c3e5d1d.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_d48038634d4040c0a2b40930ae111c09.pdf?index=trueIn PDF document text
    • http://gogozibopuxut.epizy.com/indore_master_plan_2020.pdfIn PDF document text
    • http://jadaxoletigagin.epizy.com/cath_lab_equipment.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_4dcec157716848fda530946b1631266e.pdf?index=trueIn PDF document text
    • http://mogexusa.rf.gd/16505490162.pdfIn PDF document text
    • http://tiwojojerat.rf.gd/41600712386.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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 5516 bytes
SHA-256: 283c7a560e66dce8d49f31cd9c7257b20f7cb2563edf81a2645a2021d26dba4b
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 11648 bytes
SHA-256: 7092d58a9eac3f5a788068635d4b4c92e45393b9e932ca69468307f91b83a47b

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