Malicious PDF — malware analysis report

Static analysis result for SHA-256 faea445cc8db95c8…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 02:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67eae4fa8ff4f22170586f177a34ec24 SHA-1: 2d5f9101676e8ce0267b501e3fffa7889737967e SHA-256: faea445cc8db95c8514834a65bb14af78e29bacbaba65e73a75e9a003324fd3f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing. The document body, though heavily obfuscated, suggests a lure related to 'Ygopro apk download 1.5.2'. The presence of ClamAV and ML heuristic firings, along with the PDF_SEO_LINK_FARM detection, strongly indicates malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=ygopro+apk+download+1.5.2
    • https://nesotufofiwin.weebly.com/uploads/1/3/1/3/131381712/tufewurarok.pdf
    • https://cdn.sqhk.co/wisaputal/ekjcNF3/butterfly_knife_flipping_tricks.pdf
    • http://helplnstagramoffice.com/edgy_sndrome_de_adolescenter8vjl.pdf
    • https://giliruba.weebly.com/uploads/1/3/1/4/131483170/vimotaziradedaxub.pdf
    • http://confirmyourverifiedbadge.com/bebizadajakilivirasefliwr.pdf
    • https://cdn.sqhk.co/genazeres/XgiieEV/24745851865.pdf
    • https://cdn.sqhk.co/nuvaratuji/5vhbgfo/veputu.pdf
    • http://supsun-aero.com/samsung_un32j4000af_wifitbvxw.pdf
    • http://prodive.su/white-rodgers_1f80-261_installation_instructions73vy5.pdf
    • http://kefijor.mygamesonline.org/kelorinixedawunofemadizow.pdf
    • http://niginotan.22web.org/livro_acgih_2020.pdf
    • https://cdn.sqhk.co/gisatajofo/iaDMxOF/88430663301.pdf
    • http://gravkamen.ru/binary_addition_examplesi3fln.pdf
    • http://lixejinokegiror.22web.org/73039857609.pdf
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/cddf4d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_08f8991b5403415a820f413a03495628.pdf?index=true
    • http://wugerubuvugox.myartsonline.com/xilejabefekasijodepixanu.pdf
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_dd9ce0813d9c463982a5181e5980fb20.pdf?index=true
    • https://eda15335-3b41-4752-a6ea-ca28a3d9ec24.filesusr.com/ugd/db55a9_5a7b94d4e3e84c099642f1652fd59485.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_71be8c2805664d2b8ad17c2c3f6cf693.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee56.bin
b8015e85849cc508c1c9322666057853d12d2accc155e54f5156ca3d6c44bab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 5408 bytes
font_01_sfnt_off000100f2.bin
f8464cfd0c484c5c2db0b4f0c53e53d1e211f9e3b0605a28e785e50b8ed0b6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 10728 bytes

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