Malicious PDF — malware analysis report

Static analysis result for SHA-256 3730d811eac43836…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 20:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd8a1cd9efa26b5f27d0c07013a90a9a SHA-1: 1ee3cd5ef2c548fe575f2493fe2477dd035716fa SHA-256: 3730d811eac438369921bb6d44b7cb5acbc618fedb40fd253d82963c5f9748e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to a large number of other PDF files hosted on disposable domains. This pattern is often used for SEO manipulation or to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://seltec.io/images/uploads/files/zupezefanevud.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210917/1506464992.pdf
    • http://gamaxmotor.cz/data/dokumenty/zodavovese.pdf
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210901082914.pdf
    • https://braindevelopmentmaps.org/userfiles/files/34191807454.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/xadexaxorujufirajoju.pdf
    • http://mmbc.cz/_data/user_files/file/45204131261.pdf
    • http://vnationwide.com/userfiles/files/45862496618.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9e0ace5bfad958a03e71b08a7d6cfadc/19694447715.pdf
    • http://egitara.com/upfiles/files/zefexisunejo.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/83854982704.pdf
    • http://csc010.com/userfiles/file/20210915143840_cy7e18.pdf
    • http://asesoriazabalburu.org/azaba/files/file/wixamomagafagelexe.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/pevutixegelap.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d75b5b992---baxapezik.pdf
    • http://tainandentist.com/uploads/files/202109080738412249.pdf
    • http://hakanhurdacilik.com/userfiles/file/35068466010.pdf
    • http://szjglaw.com/uploadfile/file/2021090607212273499.pdf
    • http://abwlanham.com/uploads/files/12461535483.pdf
    • https://vongtaytramhuong.vn/upload/files/47906970758.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jenevixisole.pdf
    • https://nurdagihaber.com/resimler/files/51184420471.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+views+instagram+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea8.bin
4ed004e593d4c9b71bfd3857022e268f5f01e39e5990234b7f85b949c07d7699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA8 10652 bytes
font_01_sfnt_off0000c719.bin
7b5bebfbe8f1f2dff2603e36a23301aaa584e5714291243f8ab788d63d8b8c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 17460 bytes
font_02_sfnt_off0000f30b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 16792 bytes

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