Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd83c7d83fee891…

MALICIOUS

PDF

77.9 KB Created: 2021-02-27 23:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 31d272b836e9386ca78110ec5aec0207 SHA-1: 07206505d64cbab00b644025c5c2e40cf288f170 SHA-256: 7cd83c7d83fee891adec70cdb5581debbef789d53a175b7357e542872903d8cd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to 'Un curso de milagros', a common lure for phishing scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=un+curso+de+milagros+leccion+21 PDF link annotation
    • https://woliwaluv.weebly.com/uploads/1/3/4/6/134686062/bf7c1270.pdfIn PDF document text
    • https://ninuxegomozul.weebly.com/uploads/1/3/1/8/131871835/563747609f4.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/15818274300.pdfIn PDF document text
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/lagarimerofigiz-sazunonawibig-jixes-bedifane.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/nanom-puvopawoxamoz-bimalidur-napinesesaw.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/leridejuwoj_zowajemu.pdfIn PDF document text
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/masenikudo.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/wugetebijusiza.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/2ce752e5.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/types_of_war_memorials.pdfIn PDF document text
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/wogujedok-katezojipimal-jumugulizufem.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/34169212777.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/febol_vesazemud_fegot_jezugap.pdfIn PDF document text
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/6681812.pdfIn PDF document text
    • https://dunilugifesa.weebly.com/uploads/1/3/4/4/134471262/e0ffd13cb.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/15198131474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeborawaleko.atwebpages.com/24175584746.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/bose_companion_2_series_iii_multimedia_speaker_system_specs.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/89166239144.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 5436 bytes
SHA-256: e3efb29f72f2f21856ced58f0e2f6991f6693bf2d85e3aced6b635224f283bcc
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 11608 bytes
SHA-256: 265a1a6f54668352317251f701cda8075f303f4902ecf8295fcf38b52a73b725

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