Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a88be8b80a7af05…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 17:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa23223234488e9fac21b175afe42b87 SHA-1: 9c536f916ef55ed83921a89183663a539be23983 SHA-256: 3a88be8b80a7af0595fd0be9ec55482729406c7317dcf791535bdb8d89b58673
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=how+can+i+remove+files+from+my+internal+storage PDF link annotation
    • http://megaprestige.ru/uploads/files/muwewe.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/dabukabapuzu.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/43090486497.pdfIn PDF document text
    • http://paradoxine.com/upload/files/48577312398.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/tobifekesudawuxiv.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/kasevimuvunomuworemonizim.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210906233000.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/vimebaduzujipasakuxixif.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/93977892147.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce6006874---79467718478.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/77284438179.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/57483959126.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/jobafubipepa.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/veraluxetapesebi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea743486b9---togogilurisiferavuvol.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/23824471242.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/mibomufajaniromepa.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210903144842.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/zupimoregotojipudodoriji.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109160951302534.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/lapizeremoponexa.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/97117415318.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/57901540366.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 17316 bytes
SHA-256: 9524b114a08285d5a1bc7d33f91bd5377c95ea67e70a61f1be9b4e1d887e487b
font_01_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 10936 bytes
SHA-256: af45a8d09654384cccae4e762f553298390a35b769b7b7699008458670364bc7
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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