Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b640532001bed7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 07:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0b4df9bb588513f93a2e84f8c8c18b6 SHA-1: f70e27b0b22ad04e86e326e7944b9b0cfbb1ea52 SHA-256: d6b640532001bed78ee23df14dc65f9105ec30014a3b842b662161e1c6ad0364
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, with a high concentration of links on disposable domains. The embedded URLs, such as https://cnn-logistics.com/asset/files/80732366061.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://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_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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