Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed96da6b42ec976…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 15:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e02bc77dd4172dded4fe25c5f827dbe5 SHA-1: 2ba869fb18bd975983fd309cc9117a67de71a66f SHA-256: 1ed96da6b42ec976171a82e3a5cc87940568c0f0d9dacf76de94742b5b3f69c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, with many pointing to disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rc-mst.com/mst/_upload/files/9813059274.pdf In PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jurikalava.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///96720630292.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/16300854322.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/11525700472.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mewezajivosupazumisawuw.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/ludesonije.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93422427046.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/werilasa.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/16674432394.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/kipagaguwisejinetubuzax.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wizofopabefazegijones.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/nulofuruzabo.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/39800258421.pdfIn PDF document text
    • https://granitnet.hu/editor_up/70890921622.pdfIn PDF document text
    • http://skncn.com/u/files/xatomo.pdfIn PDF document text
    • https://haidangpc.com/contents/files/83100289232.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/78375313558.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/fekenarevemewuve.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bipinipozonalisikufixaj.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/ronilov.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad25a31af---dupazetotabu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/bibasunizewupuxisevawunu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/03lcrgigja03ke37k0af31r0u1/juduridibenusikaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=aplicaciones+de+las+transformaciones+lineales+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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 20204 bytes
SHA-256: ea247394c79ed9fabf8d3119ca7700fd5afdc7ba1ed5af76849853abc13dbcaa
font_01_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 10760 bytes
SHA-256: 85938e84d2aaa9e8e0f57150f180840ecdc9f8d8c4e2d843ccddd00a96efbc36
font_02_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1