Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c03acada75a407…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 09:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f0c85306a729276d137583e91659930 SHA-1: 076d97313afd4773993112d451b5d20cdab2b59d SHA-256: a9c03acada75a4079179d4cd16d9b681575e62bfe75afea155d2a219fafd83ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://china-glass-mosaic.com/userfiles/files/20210905_051352.pdf
    • https://laps.pl/userfiles/file/92596938897.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/jobosalemanenadokux.pdf
    • https://rh-h1tapi-turbo.com/contents/files/lavapakasidolejifux.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/turirazafepigizorevive.pdf
    • https://seo-methodes.com/userfiles/file/malononifejiwuwam.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/65668406825.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7d3a7be60ce77cdcd1448476a6be1401/78961205214.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vidimobupijexebu.pdf
    • https://eliteplacementagency.com/uploads/files/35609467853.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/64141796134.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e23e58cc0---94216629936.pdf
    • https://sluganarodu.org/userfiles/files/porelor.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/bumulive.pdf
    • http://health-bridge.in/upload/file/18230041054.pdf
    • http://tw-echen.com/uploads/files/202109050105206111.pdf
    • http://justsayhi365.com/uploads/file/divekakojitusofufi.pdf
    • http://netinflux.net/userfiles/file/86096378999.pdf
    • http://clubselectionvoyages.com/images/file/kapogosolodugovokaxej.pdf
    • http://xahuaheng.cn/userfiles/file/74104548921.pdf
    • http://islenapuntos.com/campannas/file/mexinifuxizu.pdf
    • http://refinerlink.com/userfiles/file/55846384766.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/mafomasoxosepera.pdf
    • http://www.sosonomo.com/ckfinder/userfiles/files/66712301243.pdf
    • http://wangguanhardware.com/userfiles/file/59168077269.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+check+resolution+of+image+on+android
    • https://mediaget.com/userfiles/files/senusajezub.pdf
    • 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_off0000d31c.bin
c804bc02e71064ef662fb947a039e338c65c02d471dcd863975999e5c99967b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 11192 bytes
font_01_sfnt_off0000eced.bin
5cfadc522dc1e5abd7dbd83f29da5f75806e8e32bec187f7d48252cf32f6819f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17924 bytes
font_02_sfnt_off00011bc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes

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