Malicious PDF — malware analysis report

Static analysis result for SHA-256 08668ec3ad7f0213…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 16:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f76a5fcc57ff3b9bd46e9fdd20fe5e4 SHA-1: 77ab4b9489243f3351463aa9e46f24e18ee34bdf SHA-256: 08668ec3ad7f0213959beaa7e5a58dba3231b10d22de1aa21a14902ce4130cea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://brihat-group.com/assets/userfiles/files/6884832735.pdf In PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/70589911585.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/2967986393.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/90226253872.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22621984782.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/52820105400.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/45655220271.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/99209067920.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/lonikuror.pdfIn PDF document text
    • http://snft.ro/media/file/26920414092.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/zusunatirugixukirubirijat.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4ae4cb52---zaxolabizefibekajewusa.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210917085732512.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jajinisifi.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090215065613.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/kugewujamejusuxegaw.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/vixobusevowutelasijana.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109030148223422.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/numer.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/61042512141.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/zojifekimu.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210907032043.pdfIn PDF document text
    • https://tmtteks.com/files/68294523919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=incremental+rpg+androidPDF link annotation
    • 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_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 17452 bytes
SHA-256: 4f754413db285a378b88817a67986e9db9f1116fa218dd709acd115c0f050fef
font_02_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 10640 bytes
SHA-256: fb5b2fffd863493aeb30a86ed13d7d8702bef25331a7d59735526636d2248831

Open this report in the interactive analyzer, or submit your own file for analysis.