Malicious PDF — malware analysis report

Static analysis result for SHA-256 418e1f78131febc7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 14:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 510e7816857d8a14ab1917633a1a43ae SHA-1: 6ecf125f814df9fec024250cada37adb8312c067 SHA-256: 418e1f78131febc716643fe4e5832e0b40e1f27ff5a94c6e55e77529c27d9073
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or spamming campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection strongly suggest a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://actybrain-consult.com/Upload/files/dibaxigokelujulemor.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/151657065502.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/90903854388.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/jamikumuduw.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/37227099358.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6e8ffcd---87510508156.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/suvumufesebuz.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xuxinusovuvejisusudufo.pdfIn PDF document text
    • http://brlairport.com/images/file/fewetubifimeruwej.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/furanutama.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/jaromamupugurodedulolujo.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/57921203719.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/89632046041.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zubupuvokufug.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/kanataluku.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/xexawapasikemif.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/bokelutaroxid.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/xibezosojimif.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/parowosezobovurajofodujo.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/42869481260.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/76439748473.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5099887605.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/29204676433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cute+bloxburg+homePDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/19963080852.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_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 10404 bytes
SHA-256: 6ddd233ac4e378cd29a805297db42e8e3a54ea850045c667b8343ee82688814f
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 19008 bytes
SHA-256: c10d4d8623bb72a92e272b18932679c24ba6a97a842803a89ed8febf116e660d
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1