Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f11afaeef9a16e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 09:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5db45a8557a30ad5f8875e3c37342cb SHA-1: c04ea05a894107d1b8d54319122aac24f101f8ec SHA-256: d8f11afaeef9a16ee14b7f003316fb6ef68e9a7450c2964d9fdbf1cdd92a32aa
126 Risk Score

Malware Insights

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

The file was detected by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as malicious. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_URI' indicates the document's primary function is to direct users to external, potentially malicious, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://bright-mineral.com/uploadfile/file/2021090320365683.pdf
    • https://gtijsr.com/userfiles/file/kosisezutuwuwovoponeze.pdf
    • http://loadcell.vn/Images_upload/files/10606894927.pdf
    • https://ost-fogging.com/upload/files/vikudepizibunakezuzadu.pdf
    • http://nikolabartakova.cz/files/file/38312534444.pdf
    • http://web5gstore.com/Files/files/45676389688.pdf
    • https://galerie-louise.be/userfiles/files/xekono.pdf
    • https://mamap.in/ci/userfiles/files/tizojivipi.pdf
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/85989915650.pdf
    • http://backkwang.com/userData/board/file/noretaxasafef.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/sixijajudibal.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/88003710259.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rdasm2kg5lnoou2r9r2jgh1g3g/30041203371.pdf
    • http://www.pacautomarketing.com/file/55470682154.pdf
    • https://priscar.com/documents/files/xosil.pdf
    • http://naphogacomposite.com/upload/files/73415527604.pdf
    • http://numere-mopede.ro/mm/file/kevipumigovu.pdf
    • http://www.jindatunnel.com/up_files/file/37546315173.pdf
    • http://cnpair.com/userfiles/file/76514704843.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/7660618883.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/5743062666.pdf
    • http://trongtinpc.com/luutru/files/96716101246.pdf
    • http://osstemcardiotec.com/files/fckeditor/file/19619951613ddba7392f0.pdf
    • https://ktmcollege.org/public_html/userfiles/file/79997921970.pdf
    • https://tessuno.com/upload/files/613cc68d55649.pdf
    • https://agape4u.org/userfiles/file/50651255022.pdf
    • http://tinhdauvietnam.vn/upload/files/86461073528.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=godzilla+defence+force+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba63.bin
df37622aeff96e6991f7de83949436e88f1ad900d03e140bf1622481bc091d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA63 18140 bytes
font_01_sfnt_off0000e892.bin
93d8e47d60292662dac52d272fcd8530f4563e98d59f342d55641e79d5875136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 10540 bytes
font_02_sfnt_off000100b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16792 bytes

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