Malicious PDF — malware analysis report

Static analysis result for SHA-256 b530355a505f3b6f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 07:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 933c0a2dfcdc4c9507ff76b30d45b28c SHA-1: 6b0b5b5bf9cc074a7770f867a142b0923039f8f4 SHA-256: b530355a505f3b6feb5b1149b14357d63028f928ac191ad6bc68a97b27e7aa69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan-like intent. The PDF contains numerous embedded links, many pointing to suspicious domains, suggesting a link farm or redirection scheme to host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://cnn-logistics.com/asset/files/80732366061.pdf In PDF document text
    • http://didaconcept.com/admin/fckeditor/file/fuzaxuwalofuwovewaze.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/budasizanemebat.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/gujowebawozirol.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/banamajivamibugunasifuju.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/57053991674.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/80654835017.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/56421616514.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/86316342559.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/95317063426.pdfIn PDF document text
    • https://akvaguru.hu/user/file/kotosasudezin.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/guligizazotofarakepegex.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/46380830797.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/tanavuza.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/803603395.pdfIn PDF document text
    • https://mimpishio.com/contents/files/kudegesovaxutufebusova.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/11037068984.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/42590730933.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/8901869980.pdfIn PDF document text
    • http://ktcz.eu/files/files/85537410145.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/72340924698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=venom+2018+movie+onlinePDF 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://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_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 17536 bytes
SHA-256: ccf7be6be8f3f83ff143d94e63f89acfbbd051b15dd8d6005c642e5373573be1
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 10280 bytes
SHA-256: fc7bc5fdb78183aa412b3065109da04f1d5442042f7fc380f50dfc8ba1a689e4

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