Malicious PDF — malware analysis report

Static analysis result for SHA-256 0021f1547fd96335…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 12:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cb442d1315c86989fcf61eccd3ea92ff SHA-1: 54c5a823fac08eb63878dc787fc660060563c046 SHA-256: 0021f1547fd96335c86c4f104de1e4143b8923294e61aa73ef925315c4cefe61
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://stehovani-ostrava.cz/static_pages_files/file/47193030689.pdf In PDF document text
    • https://bruceautoservice.com/files/file/zupigorevex.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/nuwevamididebajebazupada.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/zivalasibinirokadavakawo.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fuvitudo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gonidazivadawobenux.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gazofu.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/4375485521.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/76200134158.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/40882676160.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mixujejonukulikenegexoxer.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/vikosow.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/filawarusu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/66297760173.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///kowuj.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/bagipewilixefozadakak.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/98256291642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=main+clause+and+subordinate+clause+exercises+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 10948 bytes
SHA-256: 15e46fb87a0223b5b30a013ae6116eaf45feb897c87d87d9f94433f501ab55d2
font_01_sfnt_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 17868 bytes
SHA-256: 58ea7eae83820356582823db10b28f8b595d98c561107d67a0bc74898866a921

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