Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe6c913deae9429…

MALICIOUS

PDF

80.2 KB Created: 2021-10-07 14:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f3c7da8884d543c667105c3a5e0668c SHA-1: 35fb3d96ad401be4b7cc1892d01a3b755481b647 SHA-256: 4fe6c913deae9429a0ed435383419619890d04cfe0e04a44fde2fd1ae5548be7
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=he+is+my+cousin PDF link annotation
    • http://aolisenjiancai.com/data/files/labipoxunudari.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/dibabofafirefaxit.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/71440205488.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/mogagi.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tiwudureruzux.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/92796399966.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/71350797710.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/6383392346.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/24159949036.pdfIn PDF document text
    • http://vuason.vn/upload/files/dibezajogubewavosagadidub.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/35589579299.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20211003_8E19082B1924C0A2.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109251113145191.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/belegatiradudalipefaloni.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/devavogilodegizipedifi.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/22830320987.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/gimapepejexefud.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/48111992407.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/nelemumilorufusibu.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/jagalekemem.pdfIn PDF document text
    • http://guowangcable.com/d/files/wosivulotizawawov.pdfIn PDF document text
    • 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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 10192 bytes
SHA-256: db2ea9698a089ad32c67c845c19a992adc5e9f1508f84345c04cb8dfebb8884c
font_01_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 18728 bytes
SHA-256: a9ed1679e3f5abfc32dfead6390ce56ad77a893575f38c070430f82ff01ad945
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.