Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5585e357ac0033…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 02:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e173bf6b6c17c33812030b626f34e6bf SHA-1: 5bcb121bf2a0e7b3a1959ff931f94d0eaf4f410b SHA-256: ca5585e357ac003398c23037ca05aaafff8a81207f21fdfe558a3f7796e5a6da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/sonafuwisopudewenuf.pdf In PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/32186701266.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/63903619695.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/15264016000.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/52587949714.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/sadifizedukuselenuf.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134219e68f0f---10567534856.pdfIn PDF document text
    • https://iwistw.com/upload/files/88810251160.pdfIn PDF document text
    • http://17njl.com/userfiles/files/51432909385.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/vivonesugidarovumek.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ec99fcb76436f0cc56a155f527cb0c97/4950787000.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/jolireriborog.pdfIn PDF document text
    • https://onecre.com/images/content/files/wabuzodekolowofarod.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/2656498773.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/74838852668.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/21158430869.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/meneviza.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/1868463535.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24478881417.pdfIn PDF document text
    • http://indemo.pl/Image/files/40109739697.pdfIn PDF document text
    • http://anninh247.info/upload/files/10017396698.pdfIn PDF document text
    • http://synhbio.com/upload/files/rujala.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/7646463179.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/70200705254.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/wemukukap.pdfIn PDF document text
    • https://protum.se/file/79243730932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+crossover+book+pdfPDF 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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 16900 bytes
SHA-256: fccc1ebc320598cd5ffebec0d33764b6ba8de940ab8d90846691e5fa55f8d131
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10476 bytes
SHA-256: 88a35536bb8081191422210c6ff6406108e134f987f1a1630e6b7fbed319af35
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1