Malicious PDF — malware analysis report

Static analysis result for SHA-256 0916f4be9228072e…

MALICIOUS

PDF

90.8 KB Created: 2021-09-19 18:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0dded6704caccd7dd45a43682439ee0e SHA-1: af30ecf651c0a955e3887ff992ba727ad62ab4dd SHA-256: 0916f4be9228072efaec125f582bfd1efa6ccb6f77bb90006e82bd13dffd618f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://edubox.mn/uploads/users/0/files/58250801684.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/98454766840.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zapujamenomifimezu.pdfIn PDF document text
    • http://moretonassets.net/userfiles/55322732451.pdfIn PDF document text
    • http://www.milestonesmn.org/ckfinder/userfiles/files/memitabijofuxidaxovigewi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/57232178333.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/39905556846.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/11827319677.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/48148676056.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/rakekoxigidesixinazudupom.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_115036.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/kikajal.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8b53e2b01653784f24d451f2836d4242/mibasemopunaberi.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/zovewupawoxaw.pdfIn PDF document text
    • https://everestart.com/images/stories/file/42811220430.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/98312675591.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/32236735291.pdfIn PDF document text
    • http://alkanboya.com/files/file///tebane.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630536776.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bozozewilamuvezagulawevu.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/24762797651.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/54128982906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rich+dad%27s+retire+young+retire+rich+pdfPDF 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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 11148 bytes
SHA-256: aec804152a3efe14bd87bed8e65d0754363ff927bb764ccdbceaa342aa2c287b
font_01_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 19224 bytes
SHA-256: 3b2ff51196246c40312fba370a6495478a9581cbe75a2f7c584de969b9973873
font_02_sfnt_off00014588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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