Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff71d9483cbcd56c…

MALICIOUS

PDF

69.5 KB Created: 2020-11-18 14:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 68ebd9819625075de4f2c0c56998cc28 SHA-1: 985fda799685d3e2662b2f2c2e82f9ef6a4543b4 SHA-256: ff71d9483cbcd56ceaa3065c26b24bbd6030629d76a559758dd3e50436980c7d
96 Risk Score

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 0.9995

Heuristics 4

  • 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://trafftec.ru/aws?utm_term=pneumatic+solenoid+valve+working+principle+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485010/normal_5fa7a99b865a6.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/6959473.pdfIn PDF document text
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/3295718.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/7035760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f9a1311b22ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fad83f53b7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f8dcf6b45806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fab8ea7eb99e.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/nafibanefexex/rimibugimoxikowisina.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/mezudibeb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 5692 bytes
SHA-256: f59c451c039395a1cda0244fab61274d03d83800f6af17000bcb56ab7f699bf3
font_01_sfnt_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 10628 bytes
SHA-256: 897cf4fae68c04b05dd895ac36a6e1a189200159e07788dad69386096dabc9fc
font_02_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501