Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb87ff0d6ea0fa4f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 15:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0eeb03f87f877fe03031ca234b615e0 SHA-1: d7bb5f4f4a52c97398c6a48f6b24cc3ec10a5a7e SHA-256: eb87ff0d6ea0fa4f6f59e65c0d9ca98c0942b6018741ff6697e1c34a5a786061
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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://tidurmalam2.com/contents/files/lebur.pdf In PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/gusamozubavebunenudoxupe.pdfIn PDF document text
    • http://asfalon.com/__files/file/wirepasutiwuvepewegiti.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a060d3055---jowopaxuvizi.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/47992463687.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/12504125312.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/20762187933.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/55059248095.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/65930183896.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139197fe6d66---gitivabekijixanozidekab.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/56846547354.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/vijezuvuja.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/wikamifivefetudituwabe.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/wideluwazujawepina.pdfIn PDF document text
    • http://sql110.com/pic/10724543003.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/92548911261.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/67186654507.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/85249015187.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/91049029018.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/81585073182.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/21738383125.pdfIn PDF document text
    • http://kco.su/userfiles/file/fogenisutaxivutab.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/76006099563.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/boguke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=d+tuning+ukulelePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 17240 bytes
SHA-256: e5e87517fa11fae4d13710de98ded3815837756fb639bffc666d827cd40b06a7
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 9924 bytes
SHA-256: 2981c0cac84daaf8e0b087b26604129f5a6be4b6de9118643895e2ee380135fc