Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bb755313122113…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 01:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 01480e1e98f01167bc7a57cf6d80d878 SHA-1: 72926ccb1ad4366ccc6b6da537a646a4d64d8bfe SHA-256: e4bb755313122113f9991888e38c9c9893dd171494029d25526d2ff9e18b9fe6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. ClamAV detected this as Pdf.Phishing.Trojan, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a malicious intent to redirect users. While no scripts were directly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3718

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://catamma.ru/uplcv?utm_term=sami+gaming+pixel+gun+3d+mod+menu PDF link annotation
    • http://105chers.netsociality.com/upload/files/61690544467.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614750764d431---vojinoxatevawasosa.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/97266888338.pdfIn PDF document text
    • http://eko-uklid.com/files/file/69866779001.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/xoburelegiri.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/53938263843.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/binojabosirafuvidugu.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/14490843380.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6b24901d---sotofafezegezudobo.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/kitav.pdfIn PDF document text
    • https://produse-zilan.ro/files/kisizuji.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/ridapenegewuxudetukipirur.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/38182941500.pdfIn PDF document text
    • http://ukrfirework.com/images/file/luvelewixi.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/fozoxumajedowofakavirodup.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/ziliz.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/79605841408.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/devukapokomitonuzivigaxi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/14183675058.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/23988190582.pdfIn PDF document text
    • http://esejsc.com/upload/files/80379459243.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/4106578712.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/vatubewu.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/30018673617.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/57434984786.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/93171110870.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/muvuxeleb.pdfIn 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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 10820 bytes
SHA-256: b1429f28bcc497ad59d79e2accd048356d5050fc30aaa307ca28aa663c7ee5ee
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 19164 bytes
SHA-256: f35b249392a932b5c7e38ae8a269cab8e245288450f147913e5dcf607f1196da
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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