Malicious PDF — malware analysis report

Static analysis result for SHA-256 1936ecf3e54c5fe1…

MALICIOUS

PDF

128.8 KB Created: 2021-04-14 18:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c8d3a0931abf14939ad11c14c6f14f1c SHA-1: e6d6ec85574d6dee055cb86602a3e4f2a4406a4e SHA-256: 1936ecf3e54c5fe1aa2af1b2c80de6a4f31bc921ac7df098df7297f7377e6506
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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://druttle.ru/strik?utm_term=inequalities+unit+test+answer+key PDF link annotation
    • http://item-mask.top/86479584037ql4uz.pdfIn PDF document text
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/toweduvobekozu_boxafojilo_tejodizevisa_teromefifub.pdfIn PDF document text
    • https://delitulasuv.weebly.com/uploads/1/3/0/7/130775658/divadojigafu_lilabe_vusorabago.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/pomifusugusupipupug.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/273b04.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/words_that_start_with_zinc.pdfIn PDF document text
    • https://benesigonej.weebly.com/uploads/1/3/1/6/131607635/5f6f38551bb348.pdfIn PDF document text
    • http://kismyketio.com/beef_bottom_round_nutrition_information41td8.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/xiwebikiruwavegap.pdfIn PDF document text
    • http://heleogose.online/web_banner_mockup_psd_freehicgg.pdfIn PDF document text
    • http://salearea.pro/obra_mi_planta_de_naranja_lima_personajes_principales_y_secundariosut82s.pdfIn PDF document text
    • http://my-favshopd.online/precalculus_with_limits_a_graphing_approach_5th_editioneybg1.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/tesiwobawowopi.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/vulopudeva.pdfIn PDF document text
    • https://dewapapowirise.weebly.com/uploads/1/3/1/4/131438248/782360a17.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/1c788545-7a4e-4bce-bdf5-336788ce4f15/78708520431.pdfIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_88798414a5eb4b34805c53c7629b4a9a.pdf?index=trueIn PDF document text
    • http://sarutufasiko.atwebpages.com/traductor_de_espaol_a_ingles_con_su_pronunciacion_escrita.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_58cc2c59f9674457b66da2d3395925b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4a3abb-6b4c-46e8-8f99-f54f7a646252/hp_5610_all_in_one_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3854d289-81ce-4e76-9431-6f390f7ad035/27788709706.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_91aed13995ad427d95dc3b8f19ce0430.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_1f1acb51043f4e16b1c75e8d68daf6fc.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_a388d1815eb04f4395b618c6246fdb38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c9895d-2c2a-40be-8abc-fce2a784078e/3083297888.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_off00019131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19131 4772 bytes
SHA-256: 29898b330d642a6e4645f5bde8d35a772fa1141ae54113c755575c3e3e46c0e2
font_01_sfnt_off0001a17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17C 14092 bytes
SHA-256: 9dd38d2a69f9ffad408bb4e2ef5f1f0f21ff29ac09786a73cc740c4f0d0bee32
font_02_sfnt_off0001d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D031 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off0001e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4C9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3