Malicious PDF — malware analysis report

Static analysis result for SHA-256 183082ca58d0d8fe…

MALICIOUS

PDF

93.7 KB Created: 2021-10-06 02:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 94de78f3fb74d4ce9bfb5501398e94e0 SHA-1: 0ffc120ffada6fb59edf0a8de9985c1fec032b34 SHA-256: 183082ca58d0d8febeb55804512fb273e403690c67945852cfa04d47599f14bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the nature of the link farm and the malicious verdict suggest it could be used to deliver phishing lures or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://saaretravel.ee/images/file/44222840403.pdf In PDF document text
    • http://canadianrockies.ca/files/file/napulixomitotuno.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/segosulekuwalajeneguxave.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/butepinejasojikezag.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/sofapipupeseni.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/45777982069.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/gudimovutadisonabagalo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/godakirogikiwibawozitada.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/mibisajogogigalibalu.pdfIn PDF document text
    • https://filetorme.com/upload/files/47235689379.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/93065063931.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/89715d8f1c3e8aae3b414144418879a6.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/17426161928.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/58603633122.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/rejotexirajazuvezasuzop.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/66526871590.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/banizejemixoga.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/87858b840ba5dca337ab9434e3ede3bf/barure.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/lotonolefukagovuxe.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/dobipizimo.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/39229631687.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/zisovupexifo.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/jolazagijuzete.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/32171916238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=leave+her+to+heaven+criterionPDF 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_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 19884 bytes
SHA-256: 0d839ce2e7a696b88a455d9592cb76a05184678919d75176af0c2734202725b1
font_01_sfnt_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BB 10136 bytes
SHA-256: ca73ca1cbdec1aeed81e32e7efa58e0a7183465fd1ae0aacde4861216c57c8f9

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