Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a0d5ca31dfff4f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 08:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02cafbf3f101cb431cd5d3215ab24529 SHA-1: 0790c62a75a92c19b00b428d0c7cfc7d93644bd0 SHA-256: 27a0d5ca31dfff4f7bb29830b2a5014f9d85c8821fd7eea8add3a2301064b4f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=top+part+of+the+stomach PDF link annotation
    • http://dogalakustik.com/depo/sayfaresim/file/minadanatarimel.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/45478516395.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/34485524471.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/ronobovelamikome.pdfIn PDF document text
    • http://annabarons.lv/files/files/58607125831.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/62710013670.pdfIn PDF document text
    • http://bushurov.ru/images/files/81468338746.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xoxevogono.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zubonanut.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/19375686343.pdfIn PDF document text
    • http://workontext.ru/media/file/semevukamokixamoguzas.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/64596031155.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/dojad.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210909145549.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131a87f260f9---xulid.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nupesa.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/1377201107.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/72422525403.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/8829237159.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/mawutuger.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/neladatelewevilesuro.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/zebik.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/33764665551.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/nofarekorubinol.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_off0000c49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49F 10468 bytes
SHA-256: a09e373db2344cdbf5f374cec72e250ffa0ae4126b149e0a58a8771b4f6e3f8d
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 17336 bytes
SHA-256: 16e3d112236e7705845eb011b3afd4516150326012f7099e2b6d2fdd43d1d8f6
font_02_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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