Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f6fc3d443ff553…

MALICIOUS

PDF

100.9 KB Created: 2021-05-18 01:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0600345f00fefd223b3cff7f74bdddb3 SHA-1: 7eca7215b0c2e444705c95a9bda2482cc0347122 SHA-256: 95f6fc3d443ff5536d00fe2bb5e8de1f59efa54f6394fa102fff2fafc79b5945
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it functions as a malicious redirector and part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dafemum.ru/strik?utm_term=fluid+mechanics+cengel+solution+manual+pdf In PDF document text
    • http://dufapun.22web.org/cahier_de_vacances_pour_adultes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ffcf8a0af918.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/xadedazolexeto.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/320629.pdfIn PDF document text
    • http://norusezuluwo.iblogger.org/how_much_do_2nd_grade_teacher_make.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375086/normal_5fcbde022ec1e.pdfIn PDF document text
    • http://torevifij.iblogger.org/luvinorarodotilojofex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473645/normal_5fee9b34a06b6.pdfIn PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/3223738.pdfIn PDF document text
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/xetejepumanit_fiwifum_taturonepij.pdfIn PDF document text
    • http://dufamikalu.22web.org/17170819194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5ffc2b3d7f4cf.pdfIn PDF document text
    • https://xefozevinunakab.weebly.com/uploads/1/3/4/3/134340699/6fa3fe1ef6.pdfIn PDF document text
    • http://zatuzosej.iblogger.org/71921382337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_6058c16749652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/niveles_de_prevencion_odontologia.pdfIn PDF document text
    • http://wosolakelufix.epizy.com/problem_and_solution_passages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900ba477-72a0-4262-b947-90b98597ce01/free_printable_kindergarten_books_with_sight_words.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/danebeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f741a3-59df-4e62-bf02-bc41c86f0f9e/how_to_connect_directv_remote_to_directv_box.pdfIn PDF document text
    • http://lepigofogirevog.epizy.com/tipo_de_investigacin_descriptiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f2e9f2-1990-406a-9858-b1d09b27dc9c/79589587808.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 5428 bytes
SHA-256: 6c2a1f5bc58899ca758f701a905d84defb4803723e8cfff6ee52e15a0abbd276
font_01_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 6168 bytes
SHA-256: 96f6da995762294ea3a4027012fe6abcaa176fb300c6cb737c1f5ddadc5a0795
font_02_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 12804 bytes
SHA-256: d6648e405db86b078eeb2681730d46816a5f4def8e659527404d8249efdddec4
font_03_sfnt_off00016e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E12 16512 bytes
SHA-256: e66f51a02220c435b6a84de6528207914e5abbccaaf6db72033b122b018b1c7f

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