Malicious PDF — malware analysis report

Static analysis result for SHA-256 13992254fbfc865b…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 10:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0f910c4872de70419893e642490c46cd SHA-1: 938ed2a8a0585a7b3a78b37a6147367117ed26a1 SHA-256: 13992254fbfc865bcd9b482a6464595e994c74569254013d4daa4188061484b6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=tree+chipping+machine+rental PDF link annotation
    • https://cdn.sqhk.co/jekefebiba/cPFdjiF/small_duck_erasers.pdfIn PDF document text
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/felupike.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/eONvBhy/pocket_tanks_deluxe_download_free.pdfIn PDF document text
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/tubujuragu-zebukovomup-mulijibaxem.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/bundelkhand_university_exam_form_reprint.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/xELhhhf/5648822903.pdfIn PDF document text
    • https://rejovofutilux.weebly.com/uploads/1/3/1/4/131484728/f776d2817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fc90fb491754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/septic_arthritis_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/mojirolagixovusowek.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/47440275656.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/lesson_plan_format_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/80360573942.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/best_thriller_movies_hollywood.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/debt_items_on_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/95874676991.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/bhaiyya_my_brother_movie_songs.pdfIn PDF document text
    • http://dosidojabar.epizy.com/guide_michelin_restaurant_chaumont_sur_loire.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5120 bytes
SHA-256: b5d18ba19f28867760238aa45591a5fd2706124f89987c855c8417cef5bd186f
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10604 bytes
SHA-256: 5ddc9f613ce7f19cee13b717959551926201709ff356f25552d518b3b71b5b1b

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