Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5d77e7c878374d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 00:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0778521c5c0fbfc684ed87bb179a88ba SHA-1: 8b072f9d5af6c99050376c81f47e5f8c0f8943de SHA-256: af5d77e7c878374d871944272a2d9950087ab0a73ce0b1daf0044b2acf462209
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to various PDF files on unknown domains, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://babetravelling.com/ckfinder/userfiles2/files/35028575088.pdf In PDF document text
    • http://myucmas.com/userfiles/file/40559910631.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/25473848220.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-13/20210913234628571642.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/talawirixisugopomi.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/vojujewuxako.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/39272449425.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/36201153468.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wetamabumoduwusilatu.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/82988491965.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a87ca0bec---xisiruvasigagekemozu.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/82084738299.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/72642000990.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210914055624.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210901_071558.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/65987936751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+can+you+do+with+a+grindstone+in+minecraftPDF 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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 11172 bytes
SHA-256: 10f6522179561ab84f77a2b0d7789fb7e37e8cdd2edc308cc50084fe095870dd
font_02_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 15688 bytes
SHA-256: e6f657e15eaf7fa3d4476397385178a8872c9bb0ba87105a2d3df4f78b38dc93

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