Malicious PDF — malware analysis report

Static analysis result for SHA-256 c344fd12e2d449b8…

MALICIOUS

PDF

66.0 KB Created: 2020-12-01 05:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 51cf019debc56b3f4c6cc22655c640d5 SHA-1: 93827c9c7891954441f1bfec8c9b8afe413ef207 SHA-256: c344fd12e2d449b8e5a48bc9d493a0eec98d86fe148ecfe671bd0728bff10034
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or a scam. Although no scripts were extracted, the presence of malicious links strongly suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/wb?keyword=manualidades%20botellas%20de%20refresco In PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/numawotina.pdfIn PDF document text
    • https://madimikelijexev.weebly.com/uploads/1/3/4/7/134717844/winodof-xalivavuzule.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/bibofiku.pdfIn PDF document text
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/pidapuw-zojelijo-pugawetigoxa-jusubifem.pdfIn PDF document text
    • https://pupedabakonarow.weebly.com/uploads/1/3/4/7/134709410/266b5df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1d101d5d775a7853cf97/1606229267827/todujigewupus.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/21108307104.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe395161e25426e10450b0/1606302034451/lojenexonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e9cc41-d731-41a5-9c9e-c422442ef8c7/download_major_lazer_lean_on_me_mp3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fc25229145a8629dcfc21a7/1606570539032/ridgewood_public_library_queens.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd131452f90b7fe52ecb/t/5fc324a83485235c862de662/1606624424948/gatufe.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 5160 bytes
SHA-256: fadc3e3f58e8176210c0430b741a4745a0e12ecdcdaec5064ffee42840bd6624
font_01_sfnt_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 11004 bytes
SHA-256: 1c332261a6fee9f214bb0572bb8f9d0e4429cc62905cfd8fa18a10a94e552488

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