Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc5a29f69fef6cf…

MALICIOUS

PDF

81.6 KB Created: 2021-10-16 17:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bf81ba8fba858a6659af124f09f504f1 SHA-1: 0e35d1b012a906d851488c025b916b475d603210 SHA-256: 8bc5a29f69fef6cf2db445e4695e1eda56c2934cb29ef5ba2fa49095cdff09ea
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used for phishing or scam operations. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a likely attempt to direct users to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/45885490254.pdf In PDF document text
    • https://milosislandrooms.gr/userfiles/file/41094741397.pdfIn PDF document text
    • https://gulamanis.com/contents/files/88515719656.pdfIn PDF document text
    • https://pellevah.com/upload/files/tefagiboxitigasoni.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/xexizodagijamezitigik.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4109f456e5bd6bd745306fb85b206f5f/fufuwalefodixir.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/84299214648.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/19d1009e90dfdfaae909e0d9a8d7899f/rinofepekesakinukafo.pdfIn PDF document text
    • https://roundtable106trust.org/admin/uploads/file/97452036982.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/80772765127.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/fafumusuluvenugolomumar.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-10-5/20211005152637593842.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/55004661030.pdfIn PDF document text
    • http://gaudi.tw/upload/files/1825640102.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1633894542.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/jarixalukemafokomona.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/bulomezibixivazu.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/nivexale.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/tepiwoxipifopid.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/12677982222.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/33000102646.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/72526698011.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20211011022525142.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/xPAns0MRe5M/uplcv?utm_term=alloy+made+of+copper+and+zincPDF 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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 17644 bytes
SHA-256: 9387ca0f3dcd92148408eded426d18aec538515291c8bcd2b0c76f26bb84522a
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 10668 bytes
SHA-256: a01e32ecf14e3a2915485804e54819053d2ac970b7eaa8d33c7f87012a10cb4a