Malicious PDF — malware analysis report

Static analysis result for SHA-256 71be7ff4a0e21158…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 08:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3d05940f09513dd712411fc5db30f62 SHA-1: 4df03576bbc0954d5bafc54b1af0cc5fcfcc14f2 SHA-256: 71be7ff4a0e21158fd1f5d2aa052fc6f47f164e5379f5e2bfb8a38d8720b3429
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://merrygoldholidays.com/ckfinder/userfiles/files/26312025479.pdf In PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/87669570573.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/bizuxeneru.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/nixikitejujap.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/wonepegalagudozesukowavo.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/jubobolovolowarorexitu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f477e960---66673047572.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/56196809182.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/xelirerowirurivata.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/vuxedevid.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/23534955947.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/nuxot.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fipusesalapifudapotovi.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/50596077287.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/jivuj.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/80201524936.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/topanigipinesebepizusewo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/tuwane.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/3586653797.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/jopukuvelozewibegazewupow.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sesomer.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/linufategoso.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/rovezoravoziwujuxe.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vorugoremidonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=geometry+dash+subzero+full+version+2.2PDF 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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 18600 bytes
SHA-256: 51ba1fd9ab3fbacd12f295843a07c9f79d7a36c30fa3e2de9a2c8274354777bd
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 11324 bytes
SHA-256: 253ab372171db2b3786fd60f3ce6132ecdc61e74cfe90c170edf042fd56c787f

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