Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c07754082de617…

MALICIOUS

PDF

76.8 KB Created: 2021-04-28 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7a01e3d2c573e0d5cc5a644d7ff6c82d SHA-1: b070a410f0703f389b68eda4c2959ea9fd8f6476 SHA-256: 55c07754082de617d7235e1043f8033629a8882e2765b21f4165954fa68597fd
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 0.9996

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://seumenha.ru/strik?utm_term=caballo+de+troya+3+audiolibro+dramatizado PDF link annotation
    • https://cdn.sqhk.co/javeduner/hegjyhy/accident_incident_report_form_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_601faee31925d.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/RohhSDY/86761372585.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5fdce9db64273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_600fabc4035f9.pdfIn PDF document text
    • https://cdn.sqhk.co/xugavizira/fgfhaRg/99817311256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_606362406ddea.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/jE51jij/nazurodobugenewofoga.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/hg7fzia/59717104750.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoziku/jjjhjib/93505279042.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/lowrance_mark_4_hdi_update.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_6058444b5685b.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/3eRWidZ/chipotle_menu_form.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
    • http://lanadofebanubod.epizy.com/depazuredoxekaterar.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_6f3d6616d71d45aeb29ba83d75cd36a8.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_184337ab43964dc6a86f37269975d5f2.pdf?index=trueIn PDF document text
    • http://votofeki.epizy.com/8885223608.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_5ec075265ff54b8dafc205e8e5f5c5a5.pdf?index=trueIn PDF document text
    • http://ziwemasux.myartsonline.com/what_is_the_central_idea_in_brendan_nelsons_sorry_speech_token.pdfIn PDF document text
    • http://zoridod.epizy.com/corporate_brochure_examples.pdfIn PDF document text
    • http://devutoza.rf.gd/kixipibade.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 5048 bytes
SHA-256: 695d53600e7220daa9d2ebb67f0adc190ff9a1f9e017076e9f0aae9e29da7a2f
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 11916 bytes
SHA-256: d1f38efd5f21245383128087dc48a873651102f2c31fe14f6a2d04e9e4a8b879
font_02_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176