Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea3623d0b690409…

MALICIOUS

PDF

71.7 KB Created: 2021-02-25 08:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97146bc033fbe7b5c60fe6afe2fffe4b SHA-1: 53401f0a5f1b4b8e2cb2a897055ddebcb58bf3ec SHA-256: eea3623d0b6904097d4b3670173073ec65921e559a6c5083e75aa12b309c9ec9
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it is likely used as a lure to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=schumacher+xc103-ca+manual PDF link annotation
    • http://cheapestshop.xyz/gupugozbn68n.pdfIn PDF document text
    • http://vittorguxx.site/aws_cli_ecr_image91xeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5fd7d3e38719b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5fecb22ada4aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff929ce0f74c.pdfIn PDF document text
    • http://todomod.22web.org/11969288514.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/sibaxiluwukopob.pdfIn PDF document text
    • http://saburogamo.iblogger.org/7311078003.pdfIn PDF document text
    • http://housefashion.ru/vibixuxukabubilijev3uuqm.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/simafiweraverofurusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486367/normal_6031b0f63625f.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://kawojimulogizef.rf.gd/rolenux.pdfIn PDF document text
    • http://vejobewibibir.epizy.com/ebook_akuntansi_sektor_publik.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/aliphatic_electrophilic_substitution_reaction_mechanism.pdfIn PDF document text
    • http://mamuzov.rf.gd/iq_test_questions_with_answers_ppt.pdfIn PDF document text
    • http://rirusivinudi.rf.gd/aerospace_industries_association_annual_report.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_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 5064 bytes
SHA-256: 176c9d804982e9e817ef5080f1d6ce28ce92722c0539c21d5f9f12bb990361fd
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 10948 bytes
SHA-256: 6b682386f35c9d8efa381c8533205dcb8bebf1dec19a442c74353b983c6e8852
font_02_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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