Malicious PDF — malware analysis report

Static analysis result for SHA-256 750d00fd54fbbdb3…

MALICIOUS

PDF

74.0 KB Created: 2021-10-04 17:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dadb723f9f58eaeb83dc38009f53bd4a SHA-1: 27b5c251496907c675fcc0aaf2dd2379cc0117d8 SHA-256: 750d00fd54fbbdb32928a54ac6d5ccc670fb90aa26088334afa8ef17b25d74fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or host multiple lures. While no scripts were extracted, the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://beachfirebrands.com/userfiles/file/46748831540.pdf In PDF document text
    • http://kientrucsangtrong.com/plus/files/17740887542.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/gifejorukumeruwiwof.pdfIn PDF document text
    • https://people11people.com/uploads/File/dajisuzobetumuwokugo.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/zovoxasome.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/69044316757.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/xunoralusitawavi.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/begemisi.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/fixugija.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/7553192953.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/7775879217.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/levufisug.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/5758513059.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/10111028795.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210924_105052.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303706ee91c---27921381070.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/44756850976.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d7eec171d---31887691294.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/68994246395.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/bagejejazaxulewitilolefik.pdfIn PDF document text
    • http://robbes.nl/media/files/jalov.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/xeripoxasolame.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/33630038600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tennessee+department+of+educationPDF 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_off0000bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF4 17476 bytes
SHA-256: 29f2eb5ed8d55503b53584121aea2d6d4fa05100f60703e6d39e38abb6e61fa9
font_01_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 10796 bytes
SHA-256: 8de0bc8e5a60bff85b3695b2669e9d9f87d80c512a5dfb9461c84bd62c7f401a
font_02_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1