Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a0fd813ca9b450…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 16:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 279a40d5f4caeebb2c1be1bfc75e7231 SHA-1: a4f42587bea8af9863848142ccd7010f24971f40 SHA-256: e7a0fd813ca9b450420db95d7499c936ca57c20d96328341a0071d8805f31c6e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

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 https://hoangvan.vn/wp-content/uploads/files/53698265101.pdf In PDF document text
    • http://ff-engineering.com/userfiles/files/32727835300.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/modojifizipavojukegew.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/4777568793.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nivuxegalup.pdfIn PDF document text
    • https://digireg.cn/upload/sibifixiniwajevose.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/10056609275.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/47589324767.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/25913554440.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/25564141991.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aedb89aa1c---64254098649.pdfIn PDF document text
    • https://ienter.bg/files/gotixoxexegilajosabi.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vadanadefivoxide.pdfIn PDF document text
    • http://104408017.linker.tw/files/loxodunepogus.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/22111933122.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/fupevijavanupitinepuv.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/20510545348.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/42239192203.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109190913135035.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1rn3tv1hcq4tmdfc73bm0mib5g/97663504238.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/lasasit.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/jadawojefatubixobedutudik.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/86030961161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pick+up+me+mod+apkPDF 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_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 10352 bytes
SHA-256: 84417fbae454f7018817c57da2a25f58d0d57c11019efd25c2f9f19327622806
font_02_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 18320 bytes
SHA-256: 2b74c38595f658280d85d1343d4f065b11247197ec1c45f0efec0af42f891383

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