Malicious PDF — malware analysis report

Static analysis result for SHA-256 311a95ae582c61b5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-10 19:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1434fa64d50e371701ff895bc5c5322b SHA-1: 55815c1cea736c9704b8811410434f6019797b48 SHA-256: 311a95ae582c61b5d5724f977020952a5749b2e718801b63154877327ff3bfbb
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 0.9991

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://dafemum.ru/award?keyword=auxilio+judicial+temario+pdf+gratis PDF link annotation
    • http://sinoxesoxeraxer.iblogger.org/xovubekudosizufot.pdfIn PDF document text
    • https://lajizifoposu.weebly.com/uploads/1/3/5/9/135958207/xakivi.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/wufugofavo_nerusejiwota.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/1222027.pdfIn PDF document text
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/sanavejetofanuted.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/8122ff39.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/xugivabefogexozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_a6038e68747a4c4e9b2b6547b140022a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a1d4d2-c98c-427b-8592-8f3790c16cb2/baby_girl_clothes_sale_online.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_ce19abfe21a04298bb271612ccf27d45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb12a09c-9b67-46b5-ae76-efa3a67857f8/jagojetakazosawatim.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/76649108165.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_1735c5ec21dc4a99a7a7809733374290.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_ef3b84fd1cc24b90a29958e994f46ad9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/fantasy_football_rankings_cheat_sheet_non_ppr.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_239c780e65514f88a9106f68f8bcbdc7.pdf?index=trueIn PDF document text
    • http://sibubixusa.epizy.com/awdhesh_premi_bhojpuri_video.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/fabadupopafuwopifexat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc11b2d7-01d2-4fb8-9648-f38e51417ddc/how_to_install_focusrite_scarlett_2i2_on_pc.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_6286bdd854f8426ca3db4e9f203e2378.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/forupokisip/synthesizer_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/53030723450.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_f1251ddda4b3493d96c21cd0fa9d47a0.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_f109a8e3747c40debd60b32faa7ce71b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5608 bytes
SHA-256: 2d2cff09dc83138d1b6eee4a1ece5b94482d7255616cfdc1bcd7be96f267755f
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11716 bytes
SHA-256: 369726dba166b1917749ec02a6d1865e49a4dc5db88a56acab3f43d3f2788ce0