Malicious PDF — malware analysis report

Static analysis result for SHA-256 48667bce69fcb312…

MALICIOUS

PDF

73.7 KB Created: 2021-04-05 12:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9c1c57ccdb5065a4effa92414b498b03 SHA-1: b1949031c14100d5c1449716bca87b2b99b9b4b1 SHA-256: 48667bce69fcb31283c64ab4f1d6cfbdb8ffedc3965c6b8bfd217a4ba752172f
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-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://fokemale.ru/strik?utm_term=significance+of+othello%2527s+last+speech PDF link annotation
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/284dc6031.pdfIn PDF document text
    • https://veropomoveda.weebly.com/uploads/1/3/1/4/131453256/9255277.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/2056094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_602bf3227cb2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5fe5c458f1ce3.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/sejawerubafekixofugu.pdfIn PDF document text
    • https://fojugifobuko.weebly.com/uploads/1/3/5/3/135328464/fowudefi.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/cda603c5-4536-4860-bc46-7ff3b662390c/pufudaramifuxaxivufen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c39b73-2247-4b2f-95fc-efa74b1c56ae/45389193261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811a1b66-decd-468a-81d1-76e41f431f39/ipod_nano_used.pdfIn PDF document text
    • http://vukanaxugosazed.rf.gd/android_blur_background_layout_xml.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/77790047038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb49c07e-82f9-4b28-8626-55c574492a07/bibekoziwaretaroxale.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_321a9ab7b1a84e4182226a43ebcbf06b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/luciferase_reporter_vector_promoter.pdfIn PDF document text
    • http://zoxutuperovizo.epizy.com/clinical_nutrition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/magento_confirmation_email_template.pdfIn PDF document text
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_396356676d7b4f01aac530b6e2eb0216.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/dopejoderi.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/critique_of_pure_reason_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8210adba-74a0-4b2e-b5e0-023c9afc096d/kaliritexonutusakiw.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_9136494d42424f2bb40a84f19bfebbb0.pdf?index=trueIn 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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 5316 bytes
SHA-256: c190e3273ae3e7c651abbd1eff8e97f73c08caf57abf886a6db103cd47f6088a
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 10188 bytes
SHA-256: 7709c4bc8c440cfad4d6814953952180864fa03d98b978a4e7eeba2c4735e6eb