Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebf28f9e68ccb57…

MALICIOUS

PDF

83.1 KB Created: 2021-03-20 15:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2fa343b801c06f9bda2c8750660c26ea SHA-1: 03d918950e87a8ae701e3bdaf1b96f0b6872a7c7 SHA-256: 1ebf28f9e68ccb574ee33869b5e24807847764e6f56d65d64ff99bb673f1ca1d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The primary URL, https://mezovuduw.ru/wix?keyword=coc+private+server+apk+android, is presented as a lure for a game private server, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/wix?keyword=coc+private+server+apk+android PDF link annotation
    • http://zinusukimo.iblogger.org/87031106250.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://uploads.strikinglycdn.com/files/67c415a2-97ee-4146-8ca1-e72529026f18/2015_ford_mustang_gt_owners_manual.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_7df755964e1b4dae9b15939a6fe34a1a.pdf?index=trueIn PDF document text
    • http://pepukogabam.rf.gd/momifaxolupoxosodigeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34783f30-9e98-4e14-b88d-d4857324af49/comic_books_for_6-8_year_olds.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/91118412633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7975ebd2-62f7-4414-9d1e-054403456bd6/46689133596.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/dungeons_and_dragons_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/define_economic_environment.pdfIn PDF document text
    • http://zibuvovod.rf.gd/adventures_of_tintin_movie_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/self_categorisation_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027df520-e94f-4e22-8219-07ce95e5979a/80024069639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9699310e-2a1b-4c21-9435-e053de3fd62f/sasijamosumavuzin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77666592-bbdc-4c7b-8086-2e25ac7b7e78/learn_russian_through_podcasts.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_c07ccda40d3f439c9d38f616d4b1ea6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/57132576039.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/how_to_edit_file_for_free_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa4c2a57-0335-4465-846b-39bdba41300e/why_is_my_ac_unit_not_cooling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdf2528-7b36-41a0-bae6-ee6ea4363e3a/juteropira.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/free_online_spoken_english_classes_in_tamil.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_27dc0fc9a3374b4b99127c6d086c5152.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/178e0fd6-c1f6-435a-ab2b-43f116a5e0b0/advanced_python_3_code_examples.pdfIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/codex_adeptus_astartes_dark_angels.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_9bfc7012cc8e4e4b940a0beb7211f3ed.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 4972 bytes
SHA-256: ca58877b4cd2f801d97b83ea3b6210da2f7c1fb48b0b6e5a7cc691e5c8abbfee
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 11028 bytes
SHA-256: 85e1b8ec61e49b6c246558a45f915cf82e6fd180bc711d9d5eff58f36ea92df7
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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