Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d151af751afa1ba…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 23:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb8ba70e08edc3e1d4f65673d3457aee SHA-1: d388320dd9a2be0d0edab82e999c4a222caf930e SHA-256: 3d151af751afa1ba1c354764e83b1a8c0db8a94c6cddff72cf2cd98ecd07bd3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://sloplast.com/userfiles/files/juwaxevituganadesupiri.pdf In PDF document text
    • http://dush-kz.ru/uploads/fck/file/52419014657.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/80201524936.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/miwagifumowerorunitedores.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/21139500893.pdfIn PDF document text
    • http://pb-book.com/user_file/file/suluwidusemukitobilasa.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/38219518386.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48115221135.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gomupo.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/gojuperodaruzulajelike.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_055905.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/forakupafot.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33879484493.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/56950803811.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/3464688695.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/42384151878.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/seforoj.pdfIn PDF document text
    • http://calisnt.com/uploads/files/vumewiroselixazidavoga.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/70040951032.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zokubititi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161324798106e2---fepalavejafesagakax.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109060704001341.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zubisu.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/pojejefavaxa.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ririmesani.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/posad.pdfIn PDF document text
    • http://trieuduong.com/images/Download/tunekitabiliwek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=custom+rom+note+20+ultraPDF 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_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 17588 bytes
SHA-256: e76fa2957a0c75628cb736e4e82ef5d742ccb9d9e1f7e75f0417168f164e570e
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10548 bytes
SHA-256: 28dd5a508339e1a0d6cc81bc4310200374dca25c5494bbb7b3a28cda1a079328