Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3dd9593c24f87b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 16:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec2eef53337729c1827ae85f8f741197 SHA-1: c918d13715f29142ff76e3946ee653e0764b44d9 SHA-256: db3dd9593c24f87be3e33b64adcc9abc2d07a2fe4efac10e99cfa2ae1b73fae5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. This suggests a multi-stage attack where the initial PDF serves as a lure to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/92776286562.pdf In PDF document text
    • http://shimamura-mail-order.com/userfiles/file/4918814320.pdfIn PDF document text
    • http://rentaruedas.com/files/others/74449390001.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/76830047321.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/punevazarixudidekis.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-10/20210910210506250508.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gafibebejekeregamowo.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/17236999989.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8e142959---29661446522.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/falesejunomopatuxikokej.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc6d2911e---kuwokinufutaxowuzisazag.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/telep.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/7160102266.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/gipogipepe.pdfIn PDF document text
    • http://parfumland.sk/upl/81167729744.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/gavugigisaparesavolep.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/janup.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/20026099103.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/tusanaxeluvefoxuzimosogav.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/46703243676.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/dedupafiw.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/42618539670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+monographs+ben+cardall+pdf+downloadPDF 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_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 18244 bytes
SHA-256: 42c658a3c162778122e0645ff05dabd3384f1d6c3db2ab51cdcf8c25b17cb302
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 11064 bytes
SHA-256: fb8414ae8430415de2ceae3a809d28f1005a4eb5f7ebc7be0d61a0d948e9f32d

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