Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebb9bb1e9344f0f…

MALICIOUS

PDF

64.3 KB Created: 2020-12-18 19:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9a3ef5e8c5153592fe18efae2c29659a SHA-1: a84b3ed3d653619eccb49825fbe70187bed8f0bb SHA-256: eebb9bb1e9344f0f427db573cf48364876ef8793b694ddfd7d70a4d56a9c8294
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various websites. One such URL is https://traffset.ru/123?utm_term=triangulo+aprobado+teacher%2527s+edition+pdf, which is presented in the document body as a teacher's edition PDF. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to redirect users to potentially harmful content.

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
  • 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.
  • 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://traffset.ru/123?utm_term=triangulo+aprobado+teacher%2527s+edition+pdf PDF link annotation
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/nudirusedokenesuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5f8e2dc110e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_5f998e30b206d.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/8557605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_5f95312301ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5fb2807519a1d.pdfIn PDF document text
    • https://nepuvaduwixoki.weebly.com/uploads/1/3/4/5/134525355/vimawufamenunatasez.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/3761200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fc47cd819b72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc586c20b6b03258f54b180/t/5fcbf99a1e1a4d7de114ab48/1607203228130/tefobanoraga.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc777f5a3ccef3526eb9256/t/5fc815bfd17d55300f9f931b/1606948289131/first_grade_math_problems_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c362403f5353fd950a5e/t/5fc4fcce3570fb44d19fb740/1606745299428/wealth_magick_damon_brand.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1E 5420 bytes
SHA-256: bd8217c11b94a45fa98315e4f23bff739aac6061ddbad865ede48f51d391df36
font_01_sfnt_off0000c17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17C 11112 bytes
SHA-256: b2793a7d0b86731f3d30be5bd5d5068aa7ca113d5464d9409f77baa6e85effd4
font_02_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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