Malicious PDF — malware analysis report

Static analysis result for SHA-256 987c9da6426b9dfa…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 15:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 559d51748ae9ea263667cd998217f1fc SHA-1: 3f9f334ff25590578967363cc4fa2bdcfd7d88b6 SHA-256: 987c9da6426b9dfa0d2e6d3d2cca0bbb2019f5614feb5557257bfca458ce1d1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://imbirimbir.ru/files/88803408537.pdf In PDF document text
    • http://www.smartusb.info/images/library/File/luzak.pdfIn PDF document text
    • http://gptools.net/userfiles/file/94573847630.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/87223576724.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/vimemisozom.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/nurez.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142072a4be36---bakuwamuf.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/13475077174.pdfIn PDF document text
    • http://masonhn.com/d/files/dadob.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/werufugopegir.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nilexu.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/fuxofonisukipo.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sulozugisu.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/xijud.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/25651209235.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/3675740972.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rifabonopogowumogatuzav.pdfIn PDF document text
    • http://atrsara.ir/resource/files/27047726532.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/30950861093.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/62111796451.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/pejine.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202195449358494.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/89733795989.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/vozuzoralipamojiwuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gross+words+that+start+with+bPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 19748 bytes
SHA-256: b5bcea96aa45916f3084c91d9c932d0aee783e55f32aa20ec47d91829c708582
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10328 bytes
SHA-256: 69c779b47a3f45f9a8a26c3e3c916388bccd7755af6a8f614c6ec92d7ed62eeb
font_03_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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