Malicious PDF — malware analysis report

Static analysis result for SHA-256 d466d5ae2b5b8de5…

MALICIOUS

PDF

74.3 KB Created: 2021-09-22 11:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9510ea4ce2e8c91585e41b2b63e23547 SHA-1: 0bad5f6e9199bb7b9f1fc223627eeebfa0489ae5 SHA-256: d466d5ae2b5b8de56804789237927fdf969b534baaee05826a5585195d362c0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://proxus.nl/file/14683986797.pdf In PDF document text
    • http://linuxnewyork.com/draft/media/46035348474.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/33282907574.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442d2b596e8---21062176819.pdfIn PDF document text
    • http://innotack.com/userfiles/file/nulemenolibavox.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/jinumulatixiba.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/lemuwenurejezopu.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/gemirirol.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202195221085731.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/45192788898.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/71243453527.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/beveramewurezijiwukudeg.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/59744837375.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/43861981137.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/nawajebasatolerevivamu.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/59060707787.pdfIn PDF document text
    • http://davcpundri.com/css/file/vubizazobopiwafes.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/nimixefurepazuf.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/voturiluta.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66815015388.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/dokidi.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/77909254017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jurassic+world+fallen+kingdom+online+freePDF 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_off0000bde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE2 17116 bytes
SHA-256: 2e2534e3d6f8f61bab023e834bf68387685f9158d89647a25654bc3583310b29
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10988 bytes
SHA-256: 7ca344623518dbaaf31b46beb454eb68c176e5b10e5f351f7b1671c49ca831a9

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