Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63fe07b0be0ec1b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 15:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7210e26f00368cc4c0c6dca370c477c9 SHA-1: cc394a166bd14da1af95427d8537c52016b0c7a6 SHA-256: c63fe07b0be0ec1b0eb64c69ebf8e0620e1b9f74c10357ad869a0e7c69c6dd11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a URL containing 'unlimited coin subway surfers hack', suggesting a lure for a scam or phishing attempt. The PDF structure and embedded links are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=unlimited+coin+subway+surfers+hack
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/eb7b942e82d9b8b903ae4eb5672897f1/sadololiruxisefojapudizil.pdf
    • http://jinyezi.cn/upload/7296854724.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/paviroti.pdf
    • https://pharma-tools.pl/galeria/file/kumaris.pdf
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/64849633127.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/demasipuzemodef.pdf
    • http://abwcockeysville.com/uploads/files/fawatake.pdf
    • http://esen.life/userfiles/file/48998454933.pdf
    • https://soalmatematik.com/userfiles/file/60390396211.pdf
    • http://handsonmontessoripk.com/userfiles/files/vipazapuxogazivisovu.pdf
    • https://malashealthcare.com/userfiles/files/6957923624.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/3095634028.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/sulizofuzugagabikogosog.pdf
    • http://aviatechinform.ru/sadm_files/96731911898.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/70133280486.pdf
    • http://paroissedementon.fr/upload/files/35676713375.pdf
    • https://wsbtitan.com/images/file/fujaletulifomejodanale.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413c710e32f---tamogemejuxeri.pdf
    • https://ladymamashop.com/uploads/files/202109100625504668.pdf
    • https://myparrotfood.com/user_files/files/89832822152.pdf
    • http://swhos.com/upload/files/81288978195.pdf
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/kukozuri.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fogew.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/36082643705.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 16792 bytes
font_01_sfnt_off0000f652.bin
51b595251cac0ef5e6d6bbd5a4e118943e09d87a7e9ea6cbd4045702c1617161
pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 17508 bytes
font_02_sfnt_off000123ff.bin
60f5b1e429cc1196034bfe21acd581fe5f70698a42d04869ced1159af40234fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 11280 bytes