Malicious PDF — malware analysis report

Static analysis result for SHA-256 573df74172aaa6bf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 21:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f8df0be06001a3c11587af627544a6d SHA-1: 993653088594eb3984afa28fbcc49807a15ba917 SHA-256: 573df74172aaa6bf1d3c6b334dd2c351708f0caf9c8539f18912ee9fb0c41efe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains references to 'family island crack apk', suggesting a lure for cracked software. The presence of numerous external URIs, many pointing to PDF files on disposable or unknown domains, indicates a link farm designed to distribute malicious content. The primary attack pattern involves spearphishing attachments leading to a link farm for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://anthonyvienna.com/sites/default/files/file/xizojopuxelik.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/4574100293.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/56917190835.pdfIn PDF document text
    • http://protok.pro/upload/files/mesavabonimowanufikolaju.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/17946623221.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/31668242854.pdfIn PDF document text
    • http://farmina.ru/uploads/files/tagisaxuzobidasozog.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/59798229254.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kefegitaduxezusijeke.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/91797232949.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/tunekuwipuvibujupox.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/varik.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/mapizerijalovumimuv.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613132b8548d2---geravigifuximusosudiveso.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_060144.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24f6d36d2---wosijulekufiti.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/41111108322.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/madefawamuvixedanokuji.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/dexalidolomawit.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/buwamesugumuzugu.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/47086759215.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/penajivuxudinixavawelof.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109130454386663.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210902215150_a61de3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=family+island+crack+apkPDF 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_off0000bd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9B 19940 bytes
SHA-256: 84f0b4b06a9e41ad7f93a2695f4f10b254e553e4d1a3d95c0354c1b3436bce6c
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 10508 bytes
SHA-256: 6652c581fa4452ae29501c61aba7d9c24a8658f5ec14083243959337a49f093f