Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fc0a16ccac51db…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 22:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f29a0264d429bc8f11de322f778932e SHA-1: 1fc4ec78a34ffabe4de1120872b64da1e4525627 SHA-256: 76fc0a16ccac51db3b1c2fa4b59737df15a72cdc6c45dd447ba36b19e707095c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=download+film+suicide+squad+lk21 PDF link annotation
    • https://sweetburden.com/upload/users/files/98528859516.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/42343060553.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/59372395276.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/solenoketo.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/92048579571.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/fowotegemogubixejen.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/vepusirasuru.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35094236f---27668227760.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hu2idlrh2noiccfmlv94nt7st7/jopuwurufevawuvulo.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/suwomep.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/74093765618.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/xumezaruzesemewodazigofab.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jopedepujaneko.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109161303387306.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/kugotozudewunemadalujeve.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/xuvipipifinegizusala.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/rakesebugigawusoj.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/lijonasuzetifagelopasos.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210917200233.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/20765842571.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090110160773499.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/88814664605.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/9972410965.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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 11036 bytes
SHA-256: 0784eb69244682cdcc426a3849123947115c0eb010fb91839279e51ee12db653
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 18688 bytes
SHA-256: 8fd8b8427d6fff0219725c19032032ac9a3d3504403e0fba16c029ef5c8ef0f9