Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec93c071854cdd6d…

MALICIOUS

PDF

69.3 KB Created: 2020-12-30 09:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: eb1cb459d9e0f586930ac9a688cb459e SHA-1: 9619df99ccfbfd2ea3077319274980babcab0b39 SHA-256: ec93c071854cdd6dd5e0dd46c7a7def4752cee75e1b7c071481bbcd2403014d3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=q+es+dignidad+humana In PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/3016833.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/sgiicgf/mofutofibelinite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fbcae4fa7424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f8dcc4141e18.pdfIn PDF document text
    • https://nuzokubipodopu.weebly.com/uploads/1/3/4/7/134732356/5735956.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/8012761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5f9428319c634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fb7509399107.pdfIn PDF document text
    • https://cdn.sqhk.co/nazabimon/gicgi3D/masifobe.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/kobofosoxaxim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satuja/99861329800.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/78260659234.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/2011_ashrae_handbook_hvac_applications_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/ram_vs_goat.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_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 5172 bytes
SHA-256: 7e134b7661f95bfc48ddcf4c79db1b4b314bb8e978e60c966ac6e3411906e469
font_01_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 11092 bytes
SHA-256: ff8697e178b694671672234904611a4341ca1cde977efea1733461db10d3fd9f

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