Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9b241c288baa15…

MALICIOUS

PDF

106.4 KB Created: 2021-03-05 00:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 66541d3ea2775eccaddca89580fe86a1 SHA-1: b30c5f902285b213498db31dbbdc2c89116b2168 SHA-256: 7f9b241c288baa153ed65cc010306558cad9f51244536bc04f8e66a8ba0a2547
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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://seumenha.ru/123?utm_term=what+does+song+of+myself+mean PDF link annotation
    • http://sigisuzuk.getenjoyment.net/casio_w_800h_1aves.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/98053206689.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/nijivozonaxulanasofefor.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/18330502039.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/maxesumepokorobafape.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/goperot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://pezamax.myartsonline.com/lizuxolapivetana.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_e08e61d528d54e4b9638f7cb89751018.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/oxford_house_inn_thanksgiving_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/32685204447.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_87321e0e91514f01b97b27029d0a45df.pdf?index=trueIn PDF document text
    • http://fajazimigig.atwebpages.com/typewriter_repair_in_redding_california.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_0d2aea6b01d446e091870b2b00664c86.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_400e3b61eb8945908cf6315978a383b0.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/libro_de_fsica_universitaria_13_edicin.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/dark_souls_2_best_dex_weapon_pve.pdfIn PDF document text
    • https://fafbc8e2-abe2-46cb-a6a3-4b44b5c784c5.filesusr.com/ugd/b0b521_732b63f2b1b94f34bcdc800cc32fe923.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_a9cb51702d8c488d80bd235ffedceab8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rerinago/fekixagiwatepoko.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_e1660682e6fb463fbb78fcf2c58dbb2b.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off0001710b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1710B 18176 bytes
SHA-256: 9a53eb0f5d899206140142024e1329928d04523b9b037af6ea44b3d64dff0b7c
font_00_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 3560 bytes
SHA-256: 9d03f27e289fd0e5a74b28ad06c70a97f1fc542df398b150ad02a2e97710925f
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 5340 bytes
SHA-256: 8b523047182c5f80553e6407049bed500c3071a94452746873df6146a4a041e2
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_03_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 2328 bytes
SHA-256: 864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d
font_04_sfnt_off00012cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDC 2108 bytes
SHA-256: d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e
font_05_sfnt_off000136a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 6072 bytes
SHA-256: 6ed606ce2259f0ddaf8b5e86251c943bd345a4d3faa9f77bbf659ecaac4dc3bc
font_06_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 14124 bytes
SHA-256: e7f2837cc65b836a45bac380dd4e6176099db6ca8ee8c124f5342eee76841fe2
font_08_sfnt_off00018dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD8 2832 bytes
SHA-256: ee8afa51e50492bdf4d25b6b01818d2021856a0eb5271b70f188e6d094f25891