Malicious PDF — malware analysis report

Static analysis result for SHA-256 675610f3c2f6503f…

MALICIOUS

PDF

200.1 KB Created: 2021-04-02 22:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ad109ef3f20d156182d58284b326ff33 SHA-1: b7948e9c37545a7bd1dd40cb059334d9ba54085b SHA-256: 675610f3c2f6503fa1d5715ab0f2cbf0efbb8a73d1fc3eb0c224ce5966d1e99a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'crophysi.ru'. The ML classifier also flagged the PDF with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to lure users to malicious sites, likely for phishing or to download further malware. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9642

Heuristics 4

  • 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.
  • 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=micro+ornament+and+crime+manual In PDF document text
    • http://lg-supportteam.com/giwuxekamuxuzawevofemizulxi15l.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cbse_6th_class_maths_textbook_solutions_in_hindi.pdfIn PDF document text
    • http://migerov.xyz/2546736742572k0i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_601a7fbb9108c.pdfIn PDF document text
    • http://all-host.site/apprendre_anglais_facilement77fen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_6038568e3071b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483839/normal_5fe407cf3b203.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/vubufalegokivibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_605cdc3ced828.pdfIn PDF document text
    • http://vurupilinimini.iblogger.org/anzus_treaty.pdfIn PDF document text
    • http://pogadai.xyz/zeniwizi88zl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_602f0c17f0e70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fcb8db5c99a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_60341ca936b5a.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
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_feec68d897b042a4ab1a779b2370ca7b.pdf?index=trueIn PDF document text
    • http://xenadixajasole.rf.gd/23910741537.pdfIn PDF document text
    • http://pavasokunise.epizy.com/thrive_architect_guide.pdfIn PDF document text
    • https://97ca8ee5-9e40-45cc-bd46-7bc1f23d59ff.filesusr.com/ugd/112b0f_3f9b4e3d114d4d91b907b48e61309436.pdf?index=trueIn PDF document text
    • http://furipurisebete.onlinewebshop.net/cevdet_bey_ve_oullar_roman.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_c715abba25c94d2ab03d2a5187dbc97e.pdf?index=trueIn PDF document text
    • http://loruluze.epizy.com/maputarivetilolusoru.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_cb11efc9ed8f4a3d8975e561cb2bc56f.pdf?index=trueIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/sc_caste_list_in_up_2020.pdfIn PDF document text
    • http://sasusijuxekexo.rf.gd/how_to_make_homemade_ro_water_purifier.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/thinking_skills_worksheets_for_grade_1.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2C1 4792 bytes
SHA-256: 9793d59975fdcda2b7da9f9daac0c1a1d00a82a5abe466269f4c5747fb4e75f9
font_01_sfnt_off0002c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C2E8 13124 bytes
SHA-256: b7722779ff5d1b504ba07ff658757fc1b30200b39c649a158e1c9ae1d937e5c3
font_02_sfnt_off0002ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE8A 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e
font_03_sfnt_off00030371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30371 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3