Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75f7d74cb44dd1d…

MALICIOUS

PDF

108.3 KB Created: 2021-03-06 02:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e38d782b33997bff9f0a629414cdc5a SHA-1: c20e3ac6913af4398a0048c18c7984d5d33afa68 SHA-256: c75f7d74cb44dd1d56b6f8d2c9f25a2271f5c67e08d28f758c30205909a62fe5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a search query related to downloading a PDF, aligning with the link farm's purpose of distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=saraswati+puja+mantra+bengali+pdf+free+download PDF link annotation
    • http://zigodijod.iblogger.org/pevegabeligewosodoxopofof.pdfIn PDF document text
    • http://levelupguild.com/newsletter_templates_in_word_2016xpte1.pdfIn PDF document text
    • http://kopalomara.iblogger.org/hopdoddy_san_marcos_tx_menu.pdfIn PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/savigujeruwono.pdfIn PDF document text
    • https://kibixaxetoro.weebly.com/uploads/1/3/4/8/134861284/xaxojoromexomemo.pdfIn PDF document text
    • http://autoport76.online/rowakinezlb5.pdfIn PDF document text
    • https://nugekiva.weebly.com/uploads/1/3/5/3/135322430/vogurumuxuxuwewida.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/33ac69fb5201.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/zazuxawo.pdfIn PDF document text
    • http://itravelgr.com/quality_control_checklist_for_manufacturing6joqd.pdfIn PDF document text
    • http://praktika-ingenieur.com/vibamibiizux2.pdfIn PDF document text
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/zejufozosumulu-peromor-babukinefi-jupumu.pdfIn PDF document text
    • http://laditosos.iblogger.org/77757303760.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/rodipepemotutote.pdfIn PDF document text
    • http://bigpleasure.ru/12174276419zc5ow.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/956943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatevaxewobu.rf.gd/rozuvapes.pdfIn PDF document text
    • http://zuwipipulu.epizy.com/how_to_descale_the_keurig_with_vinegar.pdfIn PDF document text
    • http://xesogopobatobop.epizy.com/black_panther_movie_wallpaper.pdfIn PDF document text
    • http://tuwafexom.epizy.com/ffxiv_5._0_ast_guide.pdfIn PDF document text
    • http://bogazukutij.rf.gd/manual_bizagi_modeler_espaol.pdfIn PDF document text
    • http://sedabil.epizy.com/sulivav.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_0359132491ed418d87377cafb607ba06.pdf?index=trueIn PDF document text
    • http://lapekekefexe.rf.gd/biroxiwugenunoxirofin.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_0eddf9b8ebb14e68a15d81dfb51e48d9.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_625727fc543d4090a2049142ac3c8763.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_35b564c9c4e74ed093e59d201be56a42.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 6832 bytes
SHA-256: e3e10028fd9de6293d328af9c72079bd141f56fa8ac867df8f1a1191d0b92e4e
font_01_sfnt_off0001448e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448E 5772 bytes
SHA-256: f36d6da02e1948547ab12ef0701c1b5d509b6a4a739f6afcc9ec9c6c42ae4447
font_02_sfnt_off0001582b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582B 16404 bytes
SHA-256: 0d84bb1d6342db0fc194a412574820f636aacb38ac05ffd0dbb19244d794e5a6
font_03_sfnt_off00018a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7C 16808 bytes
SHA-256: 26e44a87bce148eb1b902849668c0023a7094e6381aa358b4184fe543f1ba423