Malicious PDF — malware analysis report

Static analysis result for SHA-256 3980e730ffd3a986…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 08:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad57271e5bbb58fd0f9c78ef5d4864db SHA-1: c0a015fbf2d7c3e8588d09fed12aa0096e25298f SHA-256: 3980e730ffd3a9861b017eda248804bdfe1a0fb9bd4398ad93d6f5759c51c617
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://1night2day.com/UserFiles/file/5439343347.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/77559213487.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/60996874487.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/23566783859.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/39348308355.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/gitejuwotizusapo.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/dapisufejorelilod.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/sopuxojaf.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/siber.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/69040504970.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/wifidozodadasolafusig.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140155bd82b7---lupivimuzivetirudet.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/dutabela.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/79368808641.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/59292647350.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/93391904811.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/33968686339.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/14438915187.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_80DB74BABB87855E.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31755056779.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130609510f0e---41555241844.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=iphone+7+pro+bangladesh+pricePDF 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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 10836 bytes
SHA-256: 04834d1b41a117fc07d30c1a67281f2cdf799cdddf29dc712283784147857f70
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 18120 bytes
SHA-256: 576e7772262333a37541a593cba04c32844914505f50c59cebf732d444f3f0f1
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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