Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c54524bde2d076a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 12:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec9e9d5093bfbac647dc9af6bdb6aaa3 SHA-1: bb6474e9ecb742c41b5859edca0f717c1f94a000 SHA-256: 3c54524bde2d076a3f4c01b11fb7320717dc4da567c397073cf0a8ca52633c24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b958089cb311abb012983423b461dccd/gurakiju.pdf In PDF document text
    • http://thailaundry.com/imgUpload/files/remuzaru.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/libinotel.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/84669536620.pdfIn PDF document text
    • http://bulmarconsult.com/files/54824280958.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909025136237308.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/korexozotokenogu.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zusarejifenesutikawog.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/kikaxixurulazefeluwilabo.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/tilapiworufafurizuvagosuk.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/47503370123.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/tagezituwo.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/20657437144.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/49001285988.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/nagopepijoxamodibofu.pdfIn PDF document text
    • http://vaynhe.com/upload/files/zefokuvazoruzejuro.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xuvametoj.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/67238627346.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/tisigijaluvajutoxesap.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/2885024738.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/nulumakexaretil.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pameruzuzogef.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/17966186058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+change+your+voicemail+on+androidPDF 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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 17644 bytes
SHA-256: c41c0351169081b696df9dacdfe921ffdc5a99f78cabd65587a540749815bfd1
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 11008 bytes
SHA-256: ff78885f847894ab8ac21d7b69938cbb7a97d5f78249487c44e5272a7ef88367
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1