Malicious PDF — malware analysis report

Static analysis result for SHA-256 de800e458b4923f8…

MALICIOUS

PDF

64.8 KB Created: 2021-02-21 21:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da3390f5febf34a2ca057e0cfa664d67 SHA-1: 0a2eff531267b961fec07a13bb99208ab5c5149f SHA-256: de800e458b4923f8c4850d665489eaf91428481d104e7aca9779858efea1eb1a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both a machine learning classifier and ClamAV. It contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=truth+and+method+second+revised+edition PDF link annotation
    • https://jumekurokenawuw.weebly.com/uploads/1/3/0/7/130739991/6330871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_602e5c857a163.pdfIn PDF document text
    • http://esplus.pro/numerical_analysis_sauer_solutionsq38te.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5ffcc3626a066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5ff4d7619f31d.pdfIn PDF document text
    • https://tovefejuxula.weebly.com/uploads/1/3/5/3/135325554/sezazuvazidakoxolir.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/fejifobewokos.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/lajegejinigek-natadutivefebe-kewujego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fdc528825173.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/newefexader.pdfIn PDF document text
    • http://jijagigipijum.iblogger.org/50988824420.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/numunodolunaz-lulet-ribuk-purulukut.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/f8d0e9.pdfIn PDF document text
    • http://onlinesos.tech/30414350004koi4z.pdfIn PDF document text
    • https://zaroralovez.weebly.com/uploads/1/3/0/8/130814195/fuwoxom.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/buruz_jopakewo_ludosezugix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 5156 bytes
SHA-256: f5656cafa899daf96c72e37708a7cfe58e7f249ebffeeb1885c5392c4f46a436
font_01_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 10632 bytes
SHA-256: bde84e5f165fe46c5c8ed10c4852ce1c3abda7258ca18a5a8dc8b87c9989eb79

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