Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3039673e31b830…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 03:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 33f4e1f327f5097987e0db6373c68137 SHA-1: 809687f1ec70855a16add46b749d544ea3a87364 SHA-256: ff3039673e31b830054e719d19c1b4b3c1191d8acaa86ac9ca7dda6dd5aa481a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://riasztoszolnok.hu/admin/fck_upload/file/51638124588.pdf In PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/50962619939.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/sanoromabopugividufuju.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/punifop.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/bosedezexazip.pdfIn PDF document text
    • http://slovoveri.org/userfiles/41478667461.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/bexodomed.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/farekine.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/puzulazokivig.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/98101942503.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6bb3a7ac---suvezejezujugidilopo.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/xikoxexekosat.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210908212836.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/96275785591.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/46992014653.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/linasuliki.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/61633688502.pdfIn PDF document text
    • http://abwessex.com/uploads/files/81734796906.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/88625862513.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/27541649863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+vc+ultimate+trainer+download+for+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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 10760 bytes
SHA-256: 7b8f00db33f888eb8c4fda86d03b571ca6800a7adfc5106bc2a26903b020b4f5
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 18040 bytes
SHA-256: 1ae75f090aec66c5e12b0dfbef6157105eb5ea76ff8c52301d1a8c4552a3e3a1
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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