Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e8d322952fc8f4…

MALICIOUS

PDF

104.3 KB Created: 2021-03-28 11:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6a1621ac8736888887497ade25ae1dd8 SHA-1: 196d637902d5356a52b194b954f695415789c011 SHA-256: b6e8d322952fc8f4b9031df2da291cb08037d9c75168f61cc788326e52c61960
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 0.9975

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://baarspo.ru/award?keyword=narasimha+swamy+kathalu+in+telugu+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475741/normal_6049f4c16676c.pdfIn PDF document text
    • https://dutajedi.weebly.com/uploads/1/3/5/9/135964159/1583125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_604d7a019fecc.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/butigujobeze.pdfIn PDF document text
    • https://baforaze.weebly.com/uploads/1/3/4/7/134756429/2790200.pdfIn PDF document text
    • http://xevokegejir.iblogger.org/22323354407.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/rirugivukalonokavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_605f9704be8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_60531a865d707.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
    • https://s3.amazonaws.com/kikunojulejuj/ejemplo_manual_de_calidad_iso_9001_versin_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1a388f-17af-4246-b61e-2f8fcd05d17c/varig.pdfIn PDF document text
    • http://sarovagovoz.rf.gd/61384024296.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/samsung_bd-jm63_manual.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_3e3ce6a4a78043c1903967184d9cf8b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/gotekozadesas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9836b32-3b35-43f0-9db7-60ead0a47acc/73567099577.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_428bb04ec16f42abb25ccb88c57fb18e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/bejeweled_2_apk_full_free.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_2b86ef9a50ae4574892b0944956fe110.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_1e0acb1852ca431085cf877c295da817.pdf?index=trueIn PDF document text
    • http://xekivis.rf.gd/50839874851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e39cd7f-b920-4242-a89a-c98f9171d9cf/xodojevozofewidofogij.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_e54d9a004b314c82b0befe9668fab936.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/westlife_songs_mix_free.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 5680 bytes
SHA-256: 9ca2df395680b48a29a60ec818b1eaa53dc1c264261c193796bd846420274764
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 3740 bytes
SHA-256: 380998d1091fdc20b7f1c1aeba8d78f77d4373c296f83289b97c927f51825d1c
font_02_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 39852 bytes
SHA-256: c85d22351a69e121f23b466938d052d14e70fde0f3cc9883134292edc47fefaa
font_03_sfnt_off00016cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDA 10668 bytes
SHA-256: 7dc01e783c730cf57e7c1c291754efe7ac4da3dfc84ae702f730a5496604f1e9