Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3ddad645ef0471…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 08:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7bb2f6d29e0dd397a857cfaccd2e816 SHA-1: 0a223bad0d4e1fd794853cfe0af14aa0734cb325 SHA-256: 6e3ddad645ef047159dfaf2c32a1f2e34c75413843bfb60af0230ce6a4a56691
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to various domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://szyoujin.com/UploadFile/file/20210902115615879.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/37845968076.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/51123886629.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/xisujikunabe.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jewibakegafi.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210918035646447291z0uk03.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32737885069.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109161626098782.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/15386093002.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/fomotawasodivesofesiwugaw.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/digol.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/97195853385.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/fugoguzisebileloz.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/14739993772.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/nixakebi.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/67333456471.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bcbp7484lihn0dbd94g5jnb8so/mesunukafazavim.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a492255dc1---90562124330.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/mekolivol.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210904015115_2127876623.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/79338127269.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopuvejafebikepox.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/lodezater.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=to+kill+a+mockingbird+read+onlinePDF 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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 16384 bytes
SHA-256: c79f8182dc2c5638cf7473c4a994efbdb876ead8ca0da0cee06bcf30cd3a6a70
font_01_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 10644 bytes
SHA-256: d5f51ea620a526d50f0ac3e7437644ea125c732a06c27ecc05dc8a35991f7db8
font_02_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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