Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb642c088336fe1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 18:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8d0d3d28c61ff39498ea9c486587aeb SHA-1: d3c9f9df30206ab7dd36ecbed89c73de3c5d6d49 SHA-256: cfb642c088336fe1e533a30962d1076d122af800088c8985f7b6e9900ab5aa83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and configured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/penuzozumaj.pdf In PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/vorigix.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/38581546205.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/25258623666.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/99944151811.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/83827716577.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/55976835721.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/82137118340.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/tamexole.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/30276254791.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/20/51353400609.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/tilikukekagezuni.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/sulumu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e254b25fd7040fb431c30c274dd99a35/27763104127.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/44606263959.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142110b3d569---dowutefelepison.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/62178933064.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95610347198.pdfIn PDF document text
    • http://qdjshg.com/files/file/42242637798.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/fudup.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/37424843303.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kemokonefuvavojivukawuwom.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/12882544328.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/56281747353.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/69320541136.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/19901374141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=toffee+apk+latest+versionPDF 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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 19540 bytes
SHA-256: 84013e9ab635b5ad3c8086a36089a2172e5a3c5ad800ad793e0f0fc036bfb7c8
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 10472 bytes
SHA-256: 9dae72546ad5e0858cc7d61597bf28fd5ccc0bed72428c9a9082098eab77b6f4