Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc16930929dc376c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 01:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6a991e8c7499518f370f92de0b528f0 SHA-1: 57c8473f04877461344abe7c0faef6b4d464106a SHA-256: dc16930929dc376ccc8d20f0531f1c671d0be38c684df2c411fa13e81bd40712
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm, likely to host or redirect to malicious content. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions, hence T1059.007 is included. The primary attack vector is likely Spearphishing Attachment (T1566.001) given the file type.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://nexxosrealty.com/userfiles/files/vifolu.pdf In PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/10395508971.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/xunut.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/veliwanujorigamijujoxis.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/40279699080.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/pabevumorib.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/57718516526.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/lezovunixasivar.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/d0fh8tjgmckfn3hvkkt5ft4jf0/zubazemo.pdfIn PDF document text
    • https://tigaintan.com/contents/files/fewevenu.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/49825849922.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109060051369009.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/93464868147.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/vufimomik.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/dirabetapevakivimizared.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be900b866---fezixo.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dagojuzirakuwe.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/99102747836.pdfIn PDF document text
    • https://tekmaker.com/upload/files/talusovotisugogop.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/75990859946.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/50427660459.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901110131_5pburj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mirror+my+emoji+face+avatarPDF 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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 19984 bytes
SHA-256: 36cecc1e763de6712290df6afa7dc5adca1f4ba117d44180faa452388d35a56a
font_01_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13925 10480 bytes
SHA-256: f39a5203a99a387869257e7804008f1444656f950b07726113508cfac08cac54

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