Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5071bef18e93dc…

MALICIOUS

PDF

39.1 KB Created: 2020-11-09 16:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ebd21d6425343cae12fc36b35bbb804a SHA-1: 9e0aaa11ad60ce8a64cd32f3cf6f6f18b11e6b8d SHA-256: 7e5071bef18e93dcd20adfd0773d29f8933c345fbea2c24a98b4a123df24e005
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffking.ru/123?keyword=worksheet+on+regular+polygons+angles PDF link annotation
    • https://foduzivanikatik.weebly.com/uploads/1/3/4/4/134492938/5543903.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/3081090.pdfIn PDF document text
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/791bf9d83063e8.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/420f5f7a589e.pdfIn PDF document text
    • https://ribifafugulif.weebly.com/uploads/1/3/4/6/134650062/d0b578b02cfc.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/damupaguvepepinezura.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/2555030.pdfIn PDF document text
    • https://taferirufip.weebly.com/uploads/1/3/4/5/134582969/5252755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6501252c-6162-4893-9490-6df61f35b0eb/49362243067.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/java_swing_interview_questions_and_answers_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e628ec-ee59-47e8-9af7-307ee8d2dd33/nabejirar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a789eb-547b-4415-93cb-09bed12800a2/77090222915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8658ea14-4f68-4f16-b8b1-cc0ef2d0b9b2/misekajosavetufa.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_off00005d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D97 5260 bytes
SHA-256: c05d73d8cfe690320ee05a9685b0750e38803f165989cdfa1c069db277177dd6
font_01_sfnt_off00006f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F90 9344 bytes
SHA-256: 4f6bd287ce8066b236645f30e0ea0ebfff90cda5bc5957d577832cdc3ba85a26

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