Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a845652c92889a1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 08:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1e40599dc567148391f5805a333dc35 SHA-1: ea5448652b50d15e2e90c18e75118fedc44c7897 SHA-256: 5a845652c92889a16ac6ce0496116c736f934c45509c83b8e2e0657e5b1d8df2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to direct users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=cannot+download+in+play+store PDF link annotation
    • http://cissi.it/userfiles/files/bimakipime.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/77954414395.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/36914818523.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/vajiriwenesesega.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/32480978588.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/bumokimuwuru.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/23605505521.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/190aa78fea450999259d95285bb02b7c/47836264749.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/mezileluzitesejititu.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/fomabofus.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/71166664791.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/fogukidefoxezuzirutore.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/76822610582.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/wegafepimo.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202196_21155_810.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zixasalajuresafe.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/97254890847.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/71886757041.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/lovawesili.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/9996026806.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4015a9623---kuxifadonenawuvezezivagu.pdfIn PDF document text
    • https://thepainter.asia/upload/files/mivol.pdfIn PDF document text
    • http://kunbot.com/upload/files/zebimu.pdfIn PDF document text
    • 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_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 10616 bytes
SHA-256: ce321e47899e653279a5b959c7c63af6f36ab9b723ae5c75b565f68a5f06a697
font_02_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16412 bytes
SHA-256: c6d650216d18888bebcb250c6b8ddf97ddd870063f6a0cc4b3dea0d0e503b6fd

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