Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81cb69e66256353…

MALICIOUS

PDF

80.1 KB Created: 2021-09-24 10:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fed32404540821977421c3e64584625 SHA-1: fde78e6f2d583123b0000a8a7fd18546113efaa5 SHA-256: f81cb69e66256353e01124434dfcc43cc14831d140dd8ea251beb109c83312b9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and structured as link farms, suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://immo-macedo.lu/userfiles/files/47524091836.pdf In PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tobewim.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82255086362.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/96589241267.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/72287152866.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/3781104556.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490ca13ca42---95696852882.pdfIn PDF document text
    • http://cold.lt/userfiles/file/26670329064.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ifakexatirires.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/waxikakigowemusixekigik.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/sumeropawazuzajokog.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pewixitapuxikofis.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/82492312508.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/44292139137.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/fudiwasumifiziguzexinu.pdfIn PDF document text
    • https://limsurempat.com/contents/files/81215221942.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/zunawif.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/sawowexewo.pdfIn PDF document text
    • http://freeorden.com/media/file/91113526626.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/nedijoritupap.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/40195222800.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/42761056580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+four+brothers+online+freePDF 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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 17904 bytes
SHA-256: 0cb38181509a7f75a3a0b8f739734fcfa1f5ff2b057824bc2ef7dd896477d284
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10664 bytes
SHA-256: 70ece7eb9d01d596a4a5130af61b9eecf0cc6d875a8fe09fbe95fa9a12da9b7c
font_02_sfnt_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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