Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e60018243b8fb6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 20:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9deae0f4821e602e075d90f8b45643d SHA-1: afef0331df6f4de570a03e54b8791cee9fe15fc2 SHA-256: 16e60018243b8fb6e3599e97b7e1fd5b0b507681dafc6335464413a3ac17c759
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. One prominent URL, 'https://pixomot.ru/uplcv?utm_term=why+is+there+no+internet+connection+on+my+phone', suggests a lure related to internet connectivity issues. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=why+is+there+no+internet+connection+on+my+phone PDF link annotation
    • http://foto-klub.dk/userfiles/file/novoxuzamufejozo.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/xosirazuz.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/54197359758.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gekizijija.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/vobuvifateliwaze.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/fatebozasimum.pdfIn PDF document text
    • http://fedime.org/imagenes/69513612002.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/40601950595.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zajotadodeko.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/56148938592.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/53223601050.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/56367275010.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/70247911913.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/50725106611.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/xagewuzejakidadeji.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/1141258259.pdfIn PDF document text
    • https://schmitz.cz/res/file/56806400048.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/tegokera.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/titajaregovajovuve.pdfIn PDF document text
    • http://gekon.net/userfiles/file/jizav.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/84843755881.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/60375578937.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/43170353640.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://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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 18436 bytes
SHA-256: 7ca334ea99897583a63ba4de4077c5a3af111b3ae79b3d2d3b2836ff32a95511
font_01_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 10536 bytes
SHA-256: 5d5cbee94aedb100281b2b060bec1ca0f19c5d6287377d4da2d97f408158f81d

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