Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7772f0defd4702…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 20:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a17a627ea3174b74d5f848d28b77bcb SHA-1: b121a2d4176ec7954b7d0a16acf7744f6133f186 SHA-256: fd7772f0defd4702b74b948cb01e03fd97fc67054126795a6904cfeb2ede536f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the PDF is designed as a link farm, pointing to numerous disposable hosting domains, which is a common tactic for phishing or malware distribution. While no scripts were extracted, the structure and numerous unknown URLs suggest it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://suksesunited.com/contents/files/83310048497.pdf In PDF document text
    • http://rydelko.pl/userfiles/file/62965693927.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/32318216733.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/12732925148.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/34674709142.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/44178573359.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/36410755444.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/88325938817.pdfIn PDF document text
    • http://coolscape.info/images/files/4530922432.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/10450688073.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jivopokuwuku.pdfIn PDF document text
    • https://clickbox.ro/images/file/25665209039.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/pemibonepew.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/zerenivakulejes.pdfIn PDF document text
    • https://pellevah.com/upload/files/lazinopilasikuwavaretadi.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/konatewikolatuwavazexokev.pdfIn PDF document text
    • http://sissonne.hu/editor_up/53568757350.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/pudomigajikotajefepa.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/84006704238.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/74300331476.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/77507776046.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161380033d2c69---nuwamililipimejafeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+resident+season+1+putlockerPDF 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_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 19484 bytes
SHA-256: e9d3c620497abcf21c529090de383b0ddf764cbdb558e56d299b16e47f420512
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10816 bytes
SHA-256: 8aafedecc58a696737d56d16aaba93c0abdc2244a17d8e104b68c7cd37cd16b6
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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