Malicious PDF — malware analysis report

Static analysis result for SHA-256 4669156bbbc5898c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 12:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 499877f1702df81a4a580276fd455496 SHA-1: 6cd039fd42cb6fa3e6f2cced39438a6a9faf2ccd SHA-256: 4669156bbbc5898c341fb3fde28df2361bbea5759364c2a05a338056f80fd4ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs pointing to other PDF files suggests a link farm designed to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cameragiaminh.com/upload/files/besoruwix.pdf In PDF document text
    • http://chinalanpa.com/images/upload/File/duwunebibarax.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/pojab.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210916000707.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/18623204629.pdfIn PDF document text
    • http://ccsl.asia/files/pezebanezokek.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210925_D9F7CE7E5224083F.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/xilomifolatutaremig.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/3781618579.pdfIn PDF document text
    • http://ranch.pl/files/file/ragesudodotezizozekaroz.pdfIn PDF document text
    • http://laduses.nl/image/file/nesoviripawumuwilepi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fubaninefemopuzav.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/vevagifowibadoroxuf.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/gajid.pdfIn PDF document text
    • http://a-pluset.com/userfiles/30695519408.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/95191086191.pdfIn PDF document text
    • https://12shio1.com/contents/files/42481359420.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/73197799973.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/pafemiwa.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/loranet.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210916_172142.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/35910218709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dream+league+soccer+2015+apk+downloadPDF 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_off0000ace7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE7 11376 bytes
SHA-256: 700004755462004138c562f3b5b9ee0639f7effb9ab472261ddab65ceb00e138
font_01_sfnt_off0000c7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A8 14764 bytes
SHA-256: e7bb9b7670be14b65e62cdb83d07b8febb8cbed0b7d8b07d241df3c0364d5aee
font_02_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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