Malicious PDF — malware analysis report

Static analysis result for SHA-256 891e77b1a82cb104…

MALICIOUS

PDF

41.2 KB Created: 2020-10-04 14:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b102b7e0138635ed717b5decd4aa1221 SHA-1: e6588e391f5f6b31b084b4ae46f5275cd96ab328 SHA-256: 891e77b1a82cb104a77c6c30b046323142e55449b0069bf28e4c1fe090e4ae80
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=international+marketing+cateora+gilly+graham In PDF document text
    • http://files.heathenmist.com/uploads/1/3/2/7/132710795/a39959a.pdfIn PDF document text
    • http://xevudi.stevehanleyhomes.com/uploads/1/3/0/8/130874232/06ececa8c2f.pdfIn PDF document text
    • http://perekab.whole-horse-protocol.com/uploads/1/3/1/3/131379730/8773808.pdfIn PDF document text
    • http://files.jerrywilliamsphotography.com/uploads/1/3/2/6/132682851/runiko.pdfIn PDF document text
    • http://files.sdtrain.net/uploads/1/3/1/8/131856146/fuvenipoxipu-zunugeton.pdfIn PDF document text
    • http://tasakes.studentvoicesnyc.org/uploads/1/3/1/3/131384414/tudadefan.pdfIn PDF document text
    • http://files.brooksidepathfinder.com/uploads/1/3/0/7/130776502/6828942.pdfIn PDF document text
    • http://files.jerseydentalstudio.com/uploads/1/3/1/3/131383604/pitikumuta.pdfIn PDF document text
    • http://pedase.newahecevents.org/uploads/1/3/2/6/132680835/e3d97b3.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_off0000634f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634F 5136 bytes
SHA-256: 33d3adc37f7b23710c879321ebfaa58b1f5f88c163f7b7d3bfe57c5947caf392
font_01_sfnt_off000074a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 10512 bytes
SHA-256: b1a711da3099ad6d8fc3c05602c6acda969ee58310f556dc3350649dac8b6b3e