Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf2688e43b44f02…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 03:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69b8fb08dadba58596aa918c7037feb0 SHA-1: 250f9951a3ced6a3d278df6ac7a14e47b1c13d52 SHA-256: bdf2688e43b44f0225220347dc0202123d4a25052e8c0f37f09e6f1fe9ec9402
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://allytemp.ru/uplcv?utm_term=ben+10+apk+download+game PDF link annotation
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/ratidu.pdfIn PDF document text
    • http://mextro.de/upload/files/zudozunobipudivupidumu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/12547722648.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/sutesa.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/mirepopekomazogojozupip.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/2404259736.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ladedawixupan.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210903235434_7u8mcu.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/31596378574.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/28144804907.pdfIn PDF document text
    • http://limoride.net/gallery/file/71339881677.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/43047730359.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/9187570277.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d1049c0d---64596110875.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/bawujafoniro.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/sireboxowaxutixarorexofu.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/61076545494.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/pibowerosowi.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/rugusifisuvomef.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/81970491869.pdfIn PDF document text
    • https://rais.bg/uploads/file/dadifolitigumaj.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e54394808---13577117531.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_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 10684 bytes
SHA-256: 8c8daa1a1b880442062cabcaafd697ee5b71e8938b891e70c0df2a7ad73b22d2
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 18072 bytes
SHA-256: 14dcbd46cb7e3cf4f3ec0a34521328cd99fa5710e0fdc8be0ce7b26a81c0e681

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