Malicious PDF — malware analysis report

Static analysis result for SHA-256 f011e7c3ee416650…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 00:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c207f90aca602b2268199099b596f91 SHA-1: 5f68087e8832c28ab93b945bb61c4a4886536b41 SHA-256: f011e7c3ee4166500a347a7e59f65ca1afe7b3c9f33ddb6eb61200abacad7e08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=miui+12+for+redmi+3s+prime PDF link annotation
    • https://dreamscapes.ca/dream_scapes/userfiles/files/30488039804.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/mitinuguvosukev.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/38424214795.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zigutegug.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f136c2a8---23040439043.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/12163012648.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/83699291654.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/68671436015.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/38598516413.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/16663885081.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/fefarokuvolivomol.pdfIn PDF document text
    • http://snft.ro/media/file/69455300615.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/46771749907.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vatuwizumovaditedej.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sizabosuv.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dexut.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/15072544573.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/23670723692.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/70637748835.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/64475975441.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/madotozitujikimemakeve.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613926509e45a---duxugilado.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/4683530049.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/42990755818.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_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 10688 bytes
SHA-256: 0e096e6530db18cf3a676b8588415a524d2bfc404ff033a5ae0f707e161fe9e7
font_02_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 17424 bytes
SHA-256: b28f70b3d182af102ba3f9df62e761f7c08b173050bd3073ab2c9df16df1db70

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