Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a7c2b725a50c9b…

MALICIOUS

PDF

88.2 KB Created: 2021-03-24 12:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8df1324e756259fc09a2d5aea30f7199 SHA-1: 9af3480cc1bd2bd46154f22f8c173dac56f07572 SHA-256: 15a7c2b725a50c9baed331bed95ed60a771087e21bb912227ffebc670b52d7a0
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 0.9993

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=on+the+genealogy+of+morality+summary PDF link annotation
    • http://nagozubotejelaj.iblogger.org/fakajagoniwobafuragifev.pdfIn PDF document text
    • http://zavulibalox.mypressonline.com/53556280731.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/analytical_skills_mcqs.pdfIn PDF document text
    • https://zezebeburopixem.weebly.com/uploads/1/3/5/3/135326834/4593743.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/filenuzeramise.pdfIn PDF document text
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/8574203.pdfIn PDF document text
    • http://rivobuda.iblogger.org/denevirofug.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/c_interview_questions_edureka.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/79065133025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cd72af-6519-486f-861a-d682b05d5fd3/happiness_beyond_thought.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d98aa0-27d2-47d8-8906-568b0e376387/ukulele_chords_girl_crush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef57a25c-b442-467f-9ab8-e41fc79cb35a/what_are_the_types_of_inferential_statistics.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_634afd3a32b941178a6ff2bdb84bb069.pdf?index=trueIn PDF document text
    • http://mikovugeg.epizy.com/benteng_takeshi_indonesia.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/cancionero_de_cuecas_para_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f43c92-429e-47e3-bcd2-9a718d27b4fa/life_books_to_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564b4155-3acf-4b1b-9dc2-a8931621a46a/os_melhores_livros_da_historia_do_brasil.pdfIn PDF document text
    • http://texozokuvet.epizy.com/lagu_always_and_forever_heatwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eac5d6f-5d8b-4dd0-982a-f074202e4149/sevojanaserizupuride.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1414bc3f-3913-4858-ae81-b6576c3b7717/vefobifo.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_e2f1e67e6cef4679a2bf4c216d9a57ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd07318e-5aa7-47c0-a796-c031ef29a938/how_long_to_study_for_actuary_exam_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8675a6f-9aaa-4db4-9a12-4c5baa3848b7/behind_closed_doors_a_true_story_of_abuse_neglect_and_survival_against_the_odds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ce55b2-a382-47b3-81d7-e13449d2407f/71623625186.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_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 5308 bytes
SHA-256: 812dd6a90dced79532ac1a9d517da64b04fdfe0f032a5b67ad9acd0acfc69fb3
font_01_sfnt_off000126f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 13012 bytes
SHA-256: 6c96b0afdce025cb673f350a1a27e4f66aa8583ced932e652e78eacc50655695