Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce71a77de9eac248…

MALICIOUS

PDF

84.5 KB Created: 2021-02-06 02:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2810fc53297520a6f0381ecf26128acc SHA-1: 0107b0aca7ad8e7cdd8e9880cdb5dad30bc29a80 SHA-256: ce71a77de9eac248a83630d0ce5ecf0cfaca0620358e0d3324f9f326eb8904dc
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or facilitate further distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://jottigo.ru/123?utm_term=seikilos+epitaph+pronunciation PDF link annotation
    • http://fuluwube.22web.org/sample_weekly_work_schedule_template.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/kupesurusipezi.pdfIn PDF document text
    • https://zulupilasafa.weebly.com/uploads/1/3/1/1/131164294/70769b78e.pdfIn PDF document text
    • http://wide-do.top/figexirotofasanatirujgz31a.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/liberation_theology_in_africa39ttp.pdfIn PDF document text
    • https://lopodegif.weebly.com/uploads/1/3/2/6/132695694/xovabit-jafofavefele-dumedog.pdfIn PDF document text
    • https://gofolonuk.weebly.com/uploads/1/3/4/3/134313710/tetemeraronibur.pdfIn PDF document text
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/7609716.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/zajugunifimunopezeja.pdfIn PDF document text
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/kowiku_tiwode.pdfIn PDF document text
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/xemofezemolij.pdfIn PDF document text
    • https://tuwubave.weebly.com/uploads/1/3/3/9/133997869/4423235.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
    • http://sugosabogakeg.rf.gd/83781941547.pdfIn PDF document text
    • http://xijaxatob.epizy.com/ominous_octet_diabetes.pdfIn PDF document text
    • http://sasunuvelew.epizy.com/custom_validation_template_driven_form_angular_7.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 5068 bytes
SHA-256: 7775c9186da0fe6956b576130e6ab63671ea2a410b35aa7c72ac7dd8e4aa32b2
font_02_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 18700 bytes
SHA-256: 8e603871b4c5550b7a6dbebba0bd635d64de362cbc3802034800d477b32dd870
font_03_sfnt_off000136ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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