Malicious PDF — malware analysis report

Static analysis result for SHA-256 be21d2bc5bb9bf0d…

MALICIOUS

PDF

85.9 KB Created: 2021-02-13 08:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bedc880a7772aa92e14026f4a7264eba SHA-1: e65f6e9f6ea19680ecd3de476c4c88ab0802ca8e SHA-256: be21d2bc5bb9bf0da2ddb65fc6c762393f6a9368a547af1f1d79090e5abfb1d3
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting external sites. While no scripts were explicitly extracted, the PDF structure and linked URLs suggest it acts as a lure for further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=facer+apk+for+smartwatch In PDF document text
    • http://mon-cmbretagne.com/hybrid_raptor_city_terrortr0nx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411686/normal_5fde68753a30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_6020623b59b1c.pdfIn PDF document text
    • http://luminar3-download.xyz/auto_tune_efx_plugin_freean2xo.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/iijcVjg/gokofewofurunepurigu.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/c62f7f.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/uo6gdvW/auto_parts_finders_pty_ltd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fe359639291b.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/d0137eac3d53.pdfIn PDF document text
    • http://pusokum.66ghz.com/courtroom_objections_cheat_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488349/normal_6019dc79381cc.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/kegisovoka.pdfIn PDF document text
    • http://italystore.pro/tijisfmbd6.pdfIn PDF document text
    • http://testrun.ru/4792860385z292n.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/giBiehf/96668596329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokitamuna.epizy.com/free_sheet_music_creator.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/nekaxaxegipowimoxepibi.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/zojifanefonewerabudanub.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 5336 bytes
SHA-256: 86d4d13590342e96a8d2e2946923c2d003406d2410a0fe9eaf37af737c725634
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 10888 bytes
SHA-256: db942c56da2c6055c6483036c0d3d3e0b22efa3f53c8ff42fd58f82c7793d2c8
font_02_sfnt_off000132fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FC 16596 bytes
SHA-256: 58e3a5ca26b007e777f7607d92f8e6b6cade11581b6ccc921b70fcbd8f603613

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