Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20503d469355bf8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 20:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a345023d2d0ac781fe2f7edfa3eb44f SHA-1: 5658efd390cbc55f11e55e380261a1b401dad294 SHA-256: a20503d469355bf8933adc4080b23a9d5099bbbd4eb2a822ac64c77bc1c9bc73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to unknown or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://gretajensen.com/ckfinder/userfiles/files/14977305445.pdf In PDF document text
    • http://swotaweb.com/img/upload/file/posamegibowemenafitugawob.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/detirizanoxemajo.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/sasaxitomup.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/sivosab.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/nepefukawerute.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/kujituvuveta.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/30694770187.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/gakolazoruwibubitareku.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/zerulefusiwuviwa.pdfIn PDF document text
    • http://dogable.de/userfiles/file/76303165924.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139203f28ff0---66373341931.pdfIn PDF document text
    • http://horvathortho.hu/tmp/18824112357.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/70372927458.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/jokawowabemoxofimiwutim.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/86236837772.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/bekipilapowo.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kamibiga.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/23311599867.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/kufetemifipiremulesuma.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061507166102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=live+photo+wallpaper+iphone+sePDF 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_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 10460 bytes
SHA-256: bc3ffcdfe44952cd0ece2450a7b35b36699548aabeba605f4193d6cf8c6fc44d
font_01_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 18064 bytes
SHA-256: 57c0b9e22b700ba88f55affe2735429b9baa3fc772b38723113fa700d568b694
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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