Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23e352a945e8f5e…

MALICIOUS

PDF

120.6 KB Created: 2021-10-11 10:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc03835a894b7388e202f6300f597e14 SHA-1: c9889b33013a6c7bb24c150201532556d7625161 SHA-256: e23e352a945e8f5e5eba77d8f467dc02c0cf16f165ee3ea2d5861b85e33fe613
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or link-farming campaign aimed at user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=sapping+meaning+in+telugu PDF link annotation
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/pajujadujibakajiforit.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16158316be882f---76464162409.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93705292770.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/65895428896.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/bibakijewen.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/koxufatosibejovubalazanej.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/90724187836.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161621c158ebf3---31394010716.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/bisosifemagugavidan.pdfIn PDF document text
    • https://cmf8.ir/data/file/toponuvadufifek.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/7571190871.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/312468352.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/53775001769.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/98345006672.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/57652125146.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/79205464204.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/duxafaledarutepatagikeme.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/tunabanazogekopiv.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/98537963445.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210929023002.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/furavizovifu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/tovojapim.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/90744983156.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vekotupugumu.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210906072500.pdfIn PDF document text
    • http://fxlcd.com/upload/file/zuziwupa.pdfIn PDF document text
    • 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_off000168ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EE 10380 bytes
SHA-256: 479c16b69d55676ff1f37e37ca61e333fcbb0392cbfcf2253457817a99828663
font_01_sfnt_off0001806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001987d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1987D 23268 bytes
SHA-256: b2c10053272056b009427e63bfd30dee9ce3061fb8131a8db0c0d14d981a9afe